{ "mode": "perldoc", "parameter": "Config", "section": "", "url": "https://www.chedong.com/phpMan.php/perldoc/Config/json", "generated": "2026-06-13T22:56:29Z", "synopsis": "use Config;\nif ($Config{usethreads}) {\nprint \"has thread support\\n\"\n}\nuse Config qw(myconfig configsh configvars configre);\nprint myconfig();\nprint configsh();\nprint configre();\nconfigvars(qw(osname archname));", "sections": { "NAME": { "content": "Config - access Perl configuration information\n", "subsections": [] }, "SYNOPSIS": { "content": "use Config;\nif ($Config{usethreads}) {\nprint \"has thread support\\n\"\n}\n\nuse Config qw(myconfig configsh configvars configre);\n\nprint myconfig();\n\nprint configsh();\n\nprint configre();\n\nconfigvars(qw(osname archname));\n", "subsections": [] }, "DESCRIPTION": { "content": "The Config module contains all the information that was available to the \"Configure\" program at\nPerl build time (over 900 values).\n\nShell variables from the config.sh file (written by Configure) are stored in the\nreadonly-variable %Config, indexed by their names.\n\nValues stored in config.sh as 'undef' are returned as undefined values. The perl \"exists\"\nfunction can be used to check if a named variable exists.\n\nFor a description of the variables, please have a look at the Glossary file, as written in the\nPorting folder, or use the url: https://github.com/Perl/perl5/blob/blead/Porting/Glossary\n", "subsections": [ { "name": "myconfig", "content": "Returns a textual summary of the major perl configuration values. See also \"-V\" in \"Command\nSwitches\" in perlrun.\n" }, { "name": "config_sh", "content": "Returns the entire perl configuration information in the form of the original config.sh\nshell variable assignment script.\n" }, { "name": "config_re", "content": "Like configsh() but returns, as a list, only the config entries who's names match the\n$regex.\n" }, { "name": "config_vars", "content": "Prints to STDOUT the values of the named configuration variable. Each is printed on a\nseparate line in the form:\n\nname='value';\n\nNames which are unknown are output as \"name='UNKNOWN';\". See also \"-V:name\" in \"Command\nSwitches\" in perlrun.\n" }, { "name": "bincompat_options", "content": "Returns a list of C pre-processor options used when compiling this perl binary, which affect\nits binary compatibility with extensions. \"bincompatoptions()\" and\n\"nonbincompatoptions()\" are shown together in the output of \"perl -V\" as *Compile-time\noptions*.\n" }, { "name": "non_bincompat_options", "content": "Returns a list of C pre-processor options used when compiling this perl binary, which do not\naffect binary compatibility with extensions.\n" }, { "name": "compile_date", "content": "Returns the compile date (as a string), equivalent to what is shown by \"perl -V\"\n" }, { "name": "local_patches", "content": "Returns a list of the names of locally applied patches, equivalent to what is shown by \"perl\n-V\".\n" }, { "name": "header_files", "content": "Returns a list of the header files that should be used as dependencies for XS code, for this\nversion of Perl on this platform.\n" } ] }, "EXAMPLE": { "content": "Here's a more sophisticated example of using %Config:\n\nuse Config;\nuse strict;\n\nmy %signum;\nmy @signame;\nunless($Config{signame} && $Config{signum}) {\ndie \"No sigs?\";\n} else {\nmy @names = split ' ', $Config{signame};\n@signum{@names} = split ' ', $Config{signum};\nforeach (@names) {\n$signame[$signum{$}] ||= $;\n}\n}\n\nprint \"signal #17 = $signame[17]\\n\";\nif ($signum{ALRM}) {\nprint \"SIGALRM is $signum{ALRM}\\n\";\n}\n", "subsections": [] }, "WARNING": { "content": "Because this information is not stored within the perl executable itself it is possible (but\nunlikely) that the information does not relate to the actual perl binary which is being used to\naccess it.\n\nThe Config module is installed into the architecture and version specific library directory\n($Config{installarchlib}) and it checks the perl version number when loaded.\n\nThe values stored in config.sh may be either single-quoted or double-quoted. Double-quoted\nstrings are handy for those cases where you need to include escape sequences in the strings. To\navoid runtime variable interpolation, any \"$\" and \"@\" characters are replaced by \"\\$\" and \"\\@\",\nrespectively. This isn't foolproof, of course, so don't embed \"\\$\" or \"\\@\" in double-quoted\nstrings unless you're willing to deal with the consequences. (The slashes will end up escaped\nand the \"$\" or \"@\" will trigger variable interpolation)\n", "subsections": [] }, "GLOSSARY": { "content": "Most \"Config\" variables are determined by the \"Configure\" script on platforms supported by it\n(which is most UNIX platforms). Some platforms have custom-made \"Config\" variables, and may thus\nnot have some of the variables described below, or may have extraneous variables specific to\nthat particular port. See the port specific documentation in such cases.\n\n\n\"a\"\nFrom Unix.U:\n\nThis variable defines the extension used for ordinary library files. For unix, it is .a. The\n. is included. Other possible values include .lib.\n\n\"exe\"\nFrom Unix.U:\n\nThis variable defines the extension used for executable files. \"DJGPP\", Cygwin and OS/2 use\n.exe. Stratus \"VOS\" uses .pm. On operating systems which do not require a specific extension\nfor executable files, this variable is empty.\n\n\"o\"\nFrom Unix.U:\n\nThis variable defines the extension used for object files. For unix, it is .o. The . is\nincluded. Other possible values include .obj.\n\na\n\"afs\"\nFrom afs.U:\n\nThis variable is set to \"true\" if \"AFS\" (Andrew File System) is used on the system, \"false\"\notherwise. It is possible to override this with a hint value or command line option, but\nyou'd better know what you are doing.\n\n\"afsroot\"\nFrom afs.U:\n\nThis variable is by default set to /afs. In the unlikely case this is not the correct root,\nit is possible to override this with a hint value or command line option. This will be used\nin subsequent tests for AFSness in the configure and test process.\n\n\"alignbytes\"\nFrom alignbytes.U:\n\nThis variable holds the number of bytes required to align a double-- or a long double when\napplicable. Usual values are 2, 4 and 8. The default is eight, for safety.\n\n\"aphostname\"\nFrom dgethname.U:\n\nThis variable contains the command which can be used to compute the host name. The command\nis fully qualified by its absolute path, to make it safe when used by a process with\nsuper-user privileges.\n\n\"apirevision\"\nFrom patchlevel.U:\n\nThe three variables, apirevision, apiversion, and apisubversion, specify the version of\nthe oldest perl binary compatible with the present perl. In a full version string such as\n5.6.1, apirevision is the 5. Prior to 5.5.640, the format was a floating point number, like\n5.00563.\n\nperl.c:incpush() and lib/lib.pm will automatically search in $sitelib/.. for older\ndirectories back to the limit specified by these api variables. This is only useful if you\nhave a perl library directory tree structured like the default one. See \"INSTALL\" for how\nthis works. The versioned siteperl directory was introduced in 5.005, so that is the lowest\npossible value. The version list appropriate for the current system is determined in\nincversionlist.U.\n\n\"XXX\" To do: Since compatibility can depend on compile time options (such as bincompat,\nlonglong, etc.) it should (perhaps) be set by Configure, but currently it isn't. Currently,\nwe read a hard-wired value from patchlevel.h. Perhaps what we ought to do is take the\nhard-wired value from patchlevel.h but then modify it if the current Configure options\nwarrant. patchlevel.h then would use an #ifdef guard.\n\n\"apisubversion\"\nFrom patchlevel.U:\n\nThe three variables, apirevision, apiversion, and apisubversion, specify the version of\nthe oldest perl binary compatible with the present perl. In a full version string such as\n5.6.1, apisubversion is the 1. See apirevision for full details.\n\n\"apiversion\"\nFrom patchlevel.U:\n\nThe three variables, apirevision, apiversion, and apisubversion, specify the version of\nthe oldest perl binary compatible with the present perl. In a full version string such as\n5.6.1, apiversion is the 6. See apirevision for full details. As a special case, 5.5.0 is\nrendered in the old-style as 5.005. (In the 5.0050x maintenance series, this was the only\nversioned directory in $sitelib.)\n\n\"apiversionstring\"\nFrom patchlevel.U:\n\nThis variable combines apirevision, apiversion, and apisubversion in a format such as\n5.6.1 (or 561) suitable for use as a directory name. This is filesystem dependent.\n\n\"ar\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nar program. After Configure runs, the value is reset to a plain \"ar\" and is not useful.\n\n\"archlib\"\nFrom archlib.U:\n\nThis variable holds the name of the directory in which the user wants to put\narchitecture-dependent public library files for $package. It is most often a local directory\nsuch as /usr/local/lib. Programs using this variable must be prepared to deal with filename\nexpansion.\n\n\"archlibexp\"\nFrom archlib.U:\n\nThis variable is the same as the archlib variable, but is filename expanded at configuration\ntime, for convenient use.\n\n\"archname\"\nFrom archname.U:\n\nThis variable is a short name to characterize the current architecture. It is used mainly to\nconstruct the default archlib.\n\n\"archname64\"\nFrom use64bits.U:\n\nThis variable is used for the 64-bitness part of $archname.\n\n\"archobjs\"\nFrom Unix.U:\n\nThis variable defines any additional objects that must be linked in with the program on this\narchitecture. On unix, it is usually empty. It is typically used to include emulations of\nunix calls or other facilities. For perl on OS/2, for example, this would include\nos2/os2.obj.\n\n\"asctimerproto\"\nFrom dasctimer.U:\n\nThis variable encodes the prototype of asctimer. It is zero if dasctimer is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dasctimer is defined.\n\n\"awk\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nawk program. After Configure runs, the value is reset to a plain \"awk\" and is not useful.\n\nb\n\"baserev\"\nFrom baserev.U:\n\nThe base revision level of this package, from the .package file.\n\n\"bash\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"bin\"\nFrom bin.U:\n\nThis variable holds the name of the directory in which the user wants to put publicly\nexecutable images for the package in question. It is most often a local directory such as\n/usr/local/bin. Programs using this variable must be prepared to deal with ~name\nsubstitution.\n\n\"binELF\"\nFrom dlsrc.U:\n\nThis variable saves the result from configure if generated binaries are in \"ELF\" format.\nOnly set to defined when the test has actually been performed, and the result was positive.\n\n\"binexp\"\nFrom bin.U:\n\nThis is the same as the bin variable, but is filename expanded at configuration time, for\nuse in your makefiles.\n\n\"bison\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nbison program. After Configure runs, the value is reset to a plain \"bison\" and is not\nuseful.\n\n\"byacc\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nbyacc program. After Configure runs, the value is reset to a plain \"byacc\" and is not\nuseful.\n\n\"byteorder\"\nFrom byteorder.U:\n\nThis variable holds the byte order in a \"UV\". In the following, larger digits indicate more\nsignificance. The variable byteorder is either 4321 on a big-endian machine, or 1234 on a\nlittle-endian, or 87654321 on a Cray ... or 3412 with weird order !\n\nc\n\"c\" From n.U:\n\nThis variable contains the \\c string if that is what causes the echo command to suppress\nnewline. Otherwise it is null. Correct usage is $echo $n \"prompt for a question: $c\".\n\n\"castflags\"\nFrom dcastneg.U:\n\nThis variable contains a flag that precise difficulties the compiler has casting odd\nfloating values to unsigned long: 0 = ok 1 = couldn't cast < 0 2 = couldn't cast >=\n0x80000000 4 = couldn't cast in argument expression list\n\n\"cat\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ncat program. After Configure runs, the value is reset to a plain \"cat\" and is not useful.\n\n\"cc\"\nFrom cc.U:\n\nThis variable holds the name of a command to execute a C compiler which can resolve multiple\nglobal references that happen to have the same name. Usual values are \"cc\" and \"gcc\".\nFervent \"ANSI\" compilers may be called \"c89\". \"AIX\" has xlc.\n\n\"cccdlflags\"\nFrom dlsrc.U:\n\nThis variable contains any special flags that might need to be passed with \"cc -c\" to\ncompile modules to be used to create a shared library that will be used for dynamic loading.\nFor hpux, this should be +z. It is up to the makefile to use it.\n\n\"ccdlflags\"\nFrom dlsrc.U:\n\nThis variable contains any special flags that might need to be passed to cc to link with a\nshared library for dynamic loading. It is up to the makefile to use it. For sunos 4.1, it\nshould be empty.\n\n\"ccflags\"\nFrom ccflags.U:\n\nThis variable contains any additional C compiler flags desired by the user. It is up to the\nMakefile to use this.\n\n\"ccflagsuselargefiles\"\nFrom uselfs.U:\n\nThis variable contains the compiler flags needed by large file builds and added to ccflags\nby hints files.\n\n\"ccname\"\nFrom Checkcc.U:\n\nThis can set either by hints files or by Configure. If using gcc, this is gcc, and if not,\nusually equal to cc, unimpressive, no? Some platforms, however, make good use of this by\nstoring the flavor of the C compiler being used here. For example if using the Sun WorkShop\nsuite, ccname will be \"workshop\".\n\n\"ccsymbols\"\nFrom Cppsym.U:\n\nThe variable contains the symbols defined by the C compiler alone. The symbols defined by\ncpp or by cc when it calls cpp are not in this list, see cppsymbols and cppccsymbols. The\nlist is a space-separated list of symbol=value tokens.\n\n\"ccversion\"\nFrom Checkcc.U:\n\nThis can set either by hints files or by Configure. If using a (non-gcc) vendor cc, this\nvariable may contain a version for the compiler.\n\n\"cfby\"\nFrom cfwho.U:\n\nLogin name of the person who ran the Configure script and answered the questions. This is\nused to tag both config.sh and configh.SH.\n\n\"cfemail\"\nFrom cfemail.U:\n\nElectronic mail address of the person who ran Configure. This can be used by units that\nrequire the user's e-mail, like MailList.U.\n\n\"cftime\"\nFrom cfwho.U:\n\nHolds the output of the \"date\" command when the configuration file was produced. This is\nused to tag both config.sh and configh.SH.\n\n\"charbits\"\nFrom charsize.U:\n\nThis variable contains the value of the \"CHARBITS\" symbol, which indicates to the C program\nhow many bits there are in a character.\n\n\"charsize\"\nFrom charsize.U:\n\nThis variable contains the value of the \"CHARSIZE\" symbol, which indicates to the C program\nhow many bytes there are in a character.\n\n\"chgrp\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"chmod\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nchmod program. After Configure runs, the value is reset to a plain \"chmod\" and is not\nuseful.\n\n\"chown\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"clocktype\"\nFrom dtimes.U:\n\nThis variable holds the type returned by times(). It can be long, or clockt on \"BSD\" sites\n(in which case should be included).\n\n\"comm\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ncomm program. After Configure runs, the value is reset to a plain \"comm\" and is not useful.\n\n\"compilerwarning\"\nFrom compilerwarning.U:\n\nThis variable holds the command to check if the file specified as a parameter contains a\ncompiler warning\n\n\"compress\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"configarg0\"\nFrom Options.U:\n\nThis variable contains the string used to invoke the Configure command, as reported by the\nshell in the $0 variable.\n\n\"configargc\"\nFrom Options.U:\n\nThis variable contains the number of command-line arguments passed to Configure, as reported\nby the shell in the $# variable. The individual arguments are stored as variables\nconfigarg1, configarg2, etc.\n\n\"configargs\"\nFrom Options.U:\n\nThis variable contains a single string giving the command-line arguments passed to\nConfigure. Spaces within arguments, quotes, and escaped characters are not correctly\npreserved. To reconstruct the command line, you must assemble the individual command line\npieces, given in configarg[0-9]*.\n\n\"contains\"\nFrom contains.U:\n\nThis variable holds the command to do a grep with a proper return status. On most sane\nsystems it is simply \"grep\". On insane systems it is a grep followed by a cat followed by a\ntest. This variable is primarily for the use of other Configure units.\n\n\"cp\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ncp program. After Configure runs, the value is reset to a plain \"cp\" and is not useful.\n\n\"cpio\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"cpp\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ncpp program. After Configure runs, the value is reset to a plain \"cpp\" and is not useful.\n\n\"cppstuff\"\nFrom cppstuff.U:\n\nThis variable contains an identification of the concatenation mechanism used by the C\npreprocessor.\n\n\"cppccsymbols\"\nFrom Cppsym.U:\n\nThe variable contains the symbols defined by the C compiler when it calls cpp. The symbols\ndefined by the cc alone or cpp alone are not in this list, see ccsymbols and cppsymbols. The\nlist is a space-separated list of symbol=value tokens.\n\n\"cppflags\"\nFrom ccflags.U:\n\nThis variable holds the flags that will be passed to the C pre- processor. It is up to the\nMakefile to use it.\n\n\"cpplast\"\nFrom cppstdin.U:\n\nThis variable has the same functionality as cppminus, only it applies to cpprun and not\ncppstdin.\n\n\"cppminus\"\nFrom cppstdin.U:\n\nThis variable contains the second part of the string which will invoke the C preprocessor on\nthe standard input and produce to standard output. This variable will have the value \"-\" if\ncppstdin needs a minus to specify standard input, otherwise the value is \"\".\n\n\"cpprun\"\nFrom cppstdin.U:\n\nThis variable contains the command which will invoke a C preprocessor on standard input and\nput the output to stdout. It is guaranteed not to be a wrapper and may be a null string if\nno preprocessor can be made directly available. This preprocessor might be different from\nthe one used by the C compiler. Don't forget to append cpplast after the preprocessor\noptions.\n\n\"cppstdin\"\nFrom cppstdin.U:\n\nThis variable contains the command which will invoke the C preprocessor on standard input\nand put the output to stdout. It is primarily used by other Configure units that ask about\npreprocessor symbols.\n\n\"cppsymbols\"\nFrom Cppsym.U:\n\nThe variable contains the symbols defined by the C preprocessor alone. The symbols defined\nby cc or by cc when it calls cpp are not in this list, see ccsymbols and cppccsymbols. The\nlist is a space-separated list of symbol=value tokens.\n\n\"cryptrproto\"\nFrom dcryptr.U:\n\nThis variable encodes the prototype of cryptr. It is zero if dcryptr is undef, and one of\nthe \"REENTRANTPROTOTABC\" macros of reentr.h if dcryptr is defined.\n\n\"cryptlib\"\nFrom dcrypt.U:\n\nThis variable holds -lcrypt or the path to a libcrypt.a archive if the crypt() function is\nnot defined in the standard C library. It is up to the Makefile to use this.\n\n\"csh\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ncsh program. After Configure runs, the value is reset to a plain \"csh\" and is not useful.\n\n\"ctermidrproto\"\nFrom dctermidr.U:\n\nThis variable encodes the prototype of ctermidr. It is zero if dctermidr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dctermidr is defined.\n\n\"ctimerproto\"\nFrom dctimer.U:\n\nThis variable encodes the prototype of ctimer. It is zero if dctimer is undef, and one of\nthe \"REENTRANTPROTOTABC\" macros of reentr.h if dctimer is defined.\n\nd\n\"dfwalk\"\nFrom dfwalk.U:\n\nThis variable conditionally defines \"HASFWALK\" if fwalk() is available to apply a\nfunction to all the file handles.\n\n\"daccept4\"\nFrom daccept4.U:\n\nThis variable conditionally defines HASACCEPT4 if accept4() is available to accept socket\nconnections.\n\n\"daccess\"\nFrom daccess.U:\n\nThis variable conditionally defines \"HASACCESS\" if the access() system call is available to\ncheck for access permissions using real IDs.\n\n\"daccessx\"\nFrom daccessx.U:\n\nThis variable conditionally defines the \"HASACCESSX\" symbol, which indicates to the C\nprogram that the accessx() routine is available.\n\n\"dacosh\"\nFrom dacosh.U:\n\nThis variable conditionally defines the \"HASACOSH\" symbol, which indicates to the C program\nthat the acosh() routine is available.\n\n\"daintl\"\nFrom daintl.U:\n\nThis variable conditionally defines the \"HASAINTL\" symbol, which indicates to the C program\nthat the aintl() routine is available. If copysignl is also present we can emulate modfl.\n\n\"dalarm\"\nFrom dalarm.U:\n\nThis variable conditionally defines the \"HASALARM\" symbol, which indicates to the C program\nthat the alarm() routine is available.\n\n\"darchlib\"\nFrom archlib.U:\n\nThis variable conditionally defines \"ARCHLIB\" to hold the pathname of architecture-dependent\nlibrary files for $package. If $archlib is the same as $privlib, then this is set to undef.\n\n\"dasctime64\"\nFrom dtimefuncs64.U:\n\nThis variable conditionally defines the HASASCTIME64 symbol, which indicates to the C\nprogram that the asctime64 () routine is available.\n\n\"dasctimer\"\nFrom dasctimer.U:\n\nThis variable conditionally defines the \"HASASCTIMER\" symbol, which indicates to the C\nprogram that the asctimer() routine is available.\n\n\"dasinh\"\nFrom dasinh.U:\n\nThis variable conditionally defines the \"HASASINH\" symbol, which indicates to the C program\nthat the asinh() routine is available.\n\n\"datanh\"\nFrom datanh.U:\n\nThis variable conditionally defines the \"HASATANH\" symbol, which indicates to the C program\nthat the atanh() routine is available.\n\n\"datolf\"\nFrom atolf.U:\n\nThis variable conditionally defines the \"HASATOLF\" symbol, which indicates to the C program\nthat the atolf() routine is available.\n\n\"datoll\"\nFrom atoll.U:\n\nThis variable conditionally defines the \"HASATOLL\" symbol, which indicates to the C program\nthat the atoll() routine is available.\n\n\"dattributealwaysinline\"\nFrom dattribut.U:\n\nThis variable conditionally defines \"HASATTRIBUTEALWAYSINLINE\", which indicates that the C\ncompiler can know that certain functions should always be inlined.\n\n\"dattributedeprecated\"\nFrom dattribut.U:\n\nThis variable conditionally defines \"HASATTRIBUTEDEPRECATED\", which indicates that \"GCC\"\ncan handle the attribute for marking deprecated APIs\n\n\"dattributeformat\"\nFrom dattribut.U:\n\nThis variable conditionally defines \"HASATTRIBUTEFORMAT\", which indicates the C compiler\ncan check for printf-like formats.\n\n\"dattributemalloc\"\nFrom dattribut.U:\n\nThis variable conditionally defines \"HASATTRIBUTEMALLOC\", which indicates the C compiler\ncan understand functions as having malloc-like semantics.\n\n\"dattributenonnull\"\nFrom dattribut.U:\n\nThis variable conditionally defines \"HASATTRIBUTENONNULL\", which indicates that the C\ncompiler can know that certain arguments must not be \"NULL\", and will check accordingly at\ncompile time.\n\n\"dattributenoreturn\"\nFrom dattribut.U:\n\nThis variable conditionally defines \"HASATTRIBUTENORETURN\", which indicates that the C\ncompiler can know that certain functions are guaranteed never to return.\n\n\"dattributepure\"\nFrom dattribut.U:\n\nThis variable conditionally defines \"HASATTRIBUTEPURE\", which indicates that the C compiler\ncan know that certain functions are \"pure\" functions, meaning that they have no side\neffects, and only rely on function input and/or global data for their results.\n\n\"dattributeunused\"\nFrom dattribut.U:\n\nThis variable conditionally defines \"HASATTRIBUTEUNUSED\", which indicates that the C\ncompiler can know that certain variables and arguments may not always be used, and to not\nthrow warnings if they don't get used.\n\n\"dattributewarnunusedresult\"\nFrom dattribut.U:\n\nThis variable conditionally defines \"HASATTRIBUTEWARNUNUSEDRESULT\", which indicates that\nthe C compiler can know that certain functions have a return values that must not be\nignored, such as malloc() or open().\n\n\"dbacktrace\"\nFrom dbacktrace.U:\n\nThis variable conditionally defines the \"HASBACKTRACE\" symbol, which indicates to the C\nprogram that the backtrace() routine is available to get a stack trace.\n\n\"dbsd\"\nFrom Guess.U:\n\nThis symbol conditionally defines the symbol \"BSD\" when running on a \"BSD\" system.\n\n\"dbsdgetpgrp\"\nFrom dgetpgrp.U:\n\nThis variable conditionally defines \"USEBSDGETPGRP\" if getpgrp needs one arguments whereas\n\"USG\" one needs none.\n\n\"dbsdsetpgrp\"\nFrom dsetpgrp.U:\n\nThis variable conditionally defines \"USEBSDSETPGRP\" if setpgrp needs two arguments whereas\n\"USG\" one needs none. See also dsetpgid for a \"POSIX\" interface.\n\n\"dbuiltinaddoverflow\"\nFrom dbuiltinoverflow.U:\n\nThis variable conditionally defines \"HASBUILTINADDOVERFLOW\", which indicates that the\ncompiler supports builtinaddoverflow(x,y,&z) for safely adding x and y into z while\nchecking for overflow.\n\n\"dbuiltinchooseexpr\"\nFrom dbuiltin.U:\n\nThis conditionally defines \"HASBUILTINCHOOSEEXPR\", which indicates that the compiler\nsupports builtinchooseexpr(x,y,z). This built-in function is analogous to the \"x?y:z\"\noperator in C, except that the expression returned has its type unaltered by promotion\nrules. Also, the built-in function does not evaluate the expression that was not chosen.\n\n\"dbuiltinexpect\"\nFrom dbuiltin.U:\n\nThis conditionally defines \"HASBUILTINEXPECT\", which indicates that the compiler supports\nbuiltinexpect(exp,c). You may use builtinexpect to provide the compiler with branch\nprediction information.\n\n\"dbuiltinmuloverflow\"\nFrom dbuiltinoverflow.U:\n\nThis variable conditionally defines \"HASBUILTINMULOVERFLOW\", which indicates that the\ncompiler supports builtinmuloverflow(x,y,&z) for safely multiplying x and y into z while\nchecking for overflow.\n\n\"dbuiltinsuboverflow\"\nFrom dbuiltinoverflow.U:\n\nThis variable conditionally defines \"HASBUILTINSUBOVERFLOW\", which indicates that the\ncompiler supports builtinsuboverflow(x,y,&z) for safely subtracting y from x into z\nwhile checking for overflow.\n\n\"dc99variadicmacros\"\nFrom dc99variadic.U:\n\nThis variable conditionally defines the HASC99VARIADICMACROS symbol, which indicates to\nthe C program that C99 variadic macros are available.\n\n\"dcasti32\"\nFrom dcasti32.U:\n\nThis variable conditionally defines CASTI32, which indicates whether the C compiler can cast\nlarge floats to 32-bit ints.\n\n\"dcastneg\"\nFrom dcastneg.U:\n\nThis variable conditionally defines \"CASTNEG\", which indicates whether the C compiler can\ncast negative float to unsigned.\n\n\"dcbrt\"\nFrom dcbrt.U:\n\nThis variable conditionally defines the \"HASCBRT\" symbol, which indicates to the C program\nthat the cbrt() (cube root) function is available.\n\n\"dchown\"\nFrom dchown.U:\n\nThis variable conditionally defines the \"HASCHOWN\" symbol, which indicates to the C program\nthat the chown() routine is available.\n\n\"dchroot\"\nFrom dchroot.U:\n\nThis variable conditionally defines the \"HASCHROOT\" symbol, which indicates to the C\nprogram that the chroot() routine is available.\n\n\"dchsize\"\nFrom dchsize.U:\n\nThis variable conditionally defines the \"CHSIZE\" symbol, which indicates to the C program\nthat the chsize() routine is available to truncate files. You might need a -lx to get this\nroutine.\n\n\"dclass\"\nFrom dclass.U:\n\nThis variable conditionally defines the \"HASCLASS\" symbol, which indicates to the C program\nthat the class() routine is available.\n\n\"dclearenv\"\nFrom dclearenv.U:\n\nThis variable conditionally defines the \"HASCLEARENV\" symbol, which indicates to the C\nprogram that the clearenv () routine is available.\n\n\"dclosedir\"\nFrom dclosedir.U:\n\nThis variable conditionally defines \"HASCLOSEDIR\" if closedir() is available.\n\n\"dcmsghdrs\"\nFrom dcmsghdrs.U:\n\nThis variable conditionally defines the \"HASSTRUCTCMSGHDR\" symbol, which indicates that\nthe struct cmsghdr is supported.\n\n\"dcopysign\"\nFrom dcopysign.U:\n\nThis variable conditionally defines the \"HASCOPYSIGN\" symbol, which indicates to the C\nprogram that the copysign() routine is available.\n\n\"dcopysignl\"\nFrom dcopysignl.U:\n\nThis variable conditionally defines the \"HASCOPYSIGNL\" symbol, which indicates to the C\nprogram that the copysignl() routine is available. If aintl is also present we can emulate\nmodfl.\n\n\"dcplusplus\"\nFrom dcplusplus.U:\n\nThis variable conditionally defines the \"USECPLUSPLUS\" symbol, which indicates that a C++\ncompiler was used to compiled Perl and will be used to compile extensions.\n\n\"dcrypt\"\nFrom dcrypt.U:\n\nThis variable conditionally defines the \"CRYPT\" symbol, which indicates to the C program\nthat the crypt() routine is available to encrypt passwords and the like.\n\n\"dcryptr\"\nFrom dcryptr.U:\n\nThis variable conditionally defines the \"HASCRYPTR\" symbol, which indicates to the C\nprogram that the cryptr() routine is available.\n\n\"dcsh\"\nFrom dcsh.U:\n\nThis variable conditionally defines the \"CSH\" symbol, which indicates to the C program that\nthe C-shell exists.\n\n\"dctermid\"\nFrom dctermid.U:\n\nThis variable conditionally defines \"CTERMID\" if ctermid() is available to generate filename\nfor terminal.\n\n\"dctermidr\"\nFrom dctermidr.U:\n\nThis variable conditionally defines the \"HASCTERMIDR\" symbol, which indicates to the C\nprogram that the ctermidr() routine is available.\n\n\"dctime64\"\nFrom dtimefuncs64.U:\n\nThis variable conditionally defines the HASCTIME64 symbol, which indicates to the C program\nthat the ctime64 () routine is available.\n\n\"dctimer\"\nFrom dctimer.U:\n\nThis variable conditionally defines the \"HASCTIMER\" symbol, which indicates to the C\nprogram that the ctimer() routine is available.\n\n\"dcuserid\"\nFrom dcuserid.U:\n\nThis variable conditionally defines the \"HASCUSERID\" symbol, which indicates to the C\nprogram that the cuserid() routine is available to get character login names.\n\n\"ddbminitproto\"\nFrom ddbminitproto.U:\n\nThis variable conditionally defines the \"HASDBMINITPROTO\" symbol, which indicates to the C\nprogram that the system provides a prototype for the dbminit() function. Otherwise, it is up\nto the program to supply one.\n\n\"ddifftime\"\nFrom ddifftime.U:\n\nThis variable conditionally defines the \"HASDIFFTIME\" symbol, which indicates to the C\nprogram that the difftime() routine is available.\n\n\"ddifftime64\"\nFrom dtimefuncs64.U:\n\nThis variable conditionally defines the HASDIFFTIME64 symbol, which indicates to the C\nprogram that the difftime64 () routine is available.\n\n\"ddirddfd\"\nFrom ddirddfd.U:\n\nThis variable conditionally defines the \"HASDIRDDFD\" symbol, which indicates that the\n\"DIR\" directory stream type contains a member variable called ddfd.\n\n\"ddirfd\"\nFrom ddirfd.U:\n\nThis variable conditionally defines the \"HASDIRFD\" constant, which indicates to the C\nprogram that dirfd() is available to return the file descriptor of a directory stream.\n\n\"ddirnamlen\"\nFrom idirent.U:\n\nThis variable conditionally defines \"DIRNAMLEN\", which indicates to the C program that the\nlength of directory entry names is provided by a dnamelen field.\n\n\"ddladdr\"\nFrom ddladdr.U:\n\nThis variable conditionally defines the \"HASDLADDR\" symbol, which indicates to the C\nprogram that the dladdr() routine is available to get a stack trace.\n\n\"ddlerror\"\nFrom ddlerror.U:\n\nThis variable conditionally defines the \"HASDLERROR\" symbol, which indicates to the C\nprogram that the dlerror() routine is available.\n\n\"ddlopen\"\nFrom ddlopen.U:\n\nThis variable conditionally defines the \"HASDLOPEN\" symbol, which indicates to the C\nprogram that the dlopen() routine is available.\n\n\"ddlsymun\"\nFrom ddlsymun.U:\n\nThis variable conditionally defines \"DLSYMNEEDSUNDERSCORE\", which indicates that we need\nto prepend an underscore to the symbol name before calling dlsym().\n\n\"ddosuid\"\nFrom ddosuid.U:\n\nThis variable conditionally defines the symbol \"DOSUID\", which tells the C program that it\nshould insert setuid emulation code on hosts which have setuid #! scripts disabled.\n\n\"ddoublehasinf\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the symbol \"DOUBLEHASINF\" which indicates that the\ndouble type has an infinity.\n\n\"ddoublehasnan\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the symbol \"DOUBLEHASNAN\" which indicates that the\ndouble type has a not-a-number.\n\n\"ddoublehasnegativezero\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the symbol \"DOUBLEHASNEGATIVEZERO\" which indicates\nthat the double type has a negative zero.\n\n\"ddoublehassubnormals\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the symbol \"DOUBLEHASSUBNORMALS\" which indicates that\nthe double type has subnormals (denormals).\n\n\"ddoublestylecray\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the symbol \"DOUBLESTYLECRAY\" which indicates that the\ndouble is the 64-bit \"CRAY\" mainframe format.\n\n\"ddoublestyleibm\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the symbol \"DOUBLESTYLEIBM\", which indicates that the\ndouble is the 64-bit \"IBM\" mainframe format.\n\n\"ddoublestyleieee\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the symbol \"DOUBLESTYLEIEEE\", which indicates that the\ndouble is the 64-bit \"IEEE\" 754.\n\n\"ddoublestylevax\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the symbol \"DOUBLESTYLEVAX\", which indicates that the\ndouble is the 64-bit \"VAX\" format D or G.\n\n\"ddrand48r\"\nFrom ddrand48r.U:\n\nThis variable conditionally defines the HASDRAND48R symbol, which indicates to the C\nprogram that the drand48r() routine is available.\n\n\"ddrand48proto\"\nFrom ddrand48proto.U:\n\nThis variable conditionally defines the HASDRAND48PROTO symbol, which indicates to the C\nprogram that the system provides a prototype for the drand48() function. Otherwise, it is up\nto the program to supply one.\n\n\"ddup2\"\nFrom ddup2.U:\n\nThis variable conditionally defines HASDUP2 if dup2() is available to duplicate file\ndescriptors.\n\n\"ddup3\"\nFrom ddup3.U:\n\nThis variable conditionally defines HASDUP3 if dup3() is available to duplicate file\ndescriptors.\n\n\"dduplocale\"\nFrom dnewlocale.U:\n\nThis variable conditionally defines the \"HASDUPLOCALE\" symbol, which indicates to the C\nprogram that the duplocale() routine is available to duplicate a locale object.\n\n\"deaccess\"\nFrom deaccess.U:\n\nThis variable conditionally defines the \"HASEACCESS\" symbol, which indicates to the C\nprogram that the eaccess() routine is available.\n\n\"dendgrent\"\nFrom dendgrent.U:\n\nThis variable conditionally defines the \"HASENDGRENT\" symbol, which indicates to the C\nprogram that the endgrent() routine is available for sequential access of the group\ndatabase.\n\n\"dendgrentr\"\nFrom dendgrentr.U:\n\nThis variable conditionally defines the \"HASENDGRENTR\" symbol, which indicates to the C\nprogram that the endgrentr() routine is available.\n\n\"dendhent\"\nFrom dendhent.U:\n\nThis variable conditionally defines \"HASENDHOSTENT\" if endhostent() is available to close\nwhatever was being used for host queries.\n\n\"dendhostentr\"\nFrom dendhostentr.U:\n\nThis variable conditionally defines the \"HASENDHOSTENTR\" symbol, which indicates to the C\nprogram that the endhostentr() routine is available.\n\n\"dendnent\"\nFrom dendnent.U:\n\nThis variable conditionally defines \"HASENDNETENT\" if endnetent() is available to close\nwhatever was being used for network queries.\n\n\"dendnetentr\"\nFrom dendnetentr.U:\n\nThis variable conditionally defines the \"HASENDNETENTR\" symbol, which indicates to the C\nprogram that the endnetentr() routine is available.\n\n\"dendpent\"\nFrom dendpent.U:\n\nThis variable conditionally defines \"HASENDPROTOENT\" if endprotoent() is available to close\nwhatever was being used for protocol queries.\n\n\"dendprotoentr\"\nFrom dendprotoentr.U:\n\nThis variable conditionally defines the \"HASENDPROTOENTR\" symbol, which indicates to the C\nprogram that the endprotoentr() routine is available.\n\n\"dendpwent\"\nFrom dendpwent.U:\n\nThis variable conditionally defines the \"HASENDPWENT\" symbol, which indicates to the C\nprogram that the endpwent() routine is available for sequential access of the passwd\ndatabase.\n\n\"dendpwentr\"\nFrom dendpwentr.U:\n\nThis variable conditionally defines the \"HASENDPWENTR\" symbol, which indicates to the C\nprogram that the endpwentr() routine is available.\n\n\"dendsent\"\nFrom dendsent.U:\n\nThis variable conditionally defines \"HASENDSERVENT\" if endservent() is available to close\nwhatever was being used for service queries.\n\n\"dendserventr\"\nFrom dendserventr.U:\n\nThis variable conditionally defines the \"HASENDSERVENTR\" symbol, which indicates to the C\nprogram that the endserventr() routine is available.\n\n\"deofnblk\"\nFrom nblockio.U:\n\nThis variable conditionally defines \"EOFNONBLOCK\" if \"EOF\" can be seen when reading from a\nnon-blocking I/O source.\n\n\"derf\"\nFrom derf.U:\n\nThis variable conditionally defines the \"HASERF\" symbol, which indicates to the C program\nthat the erf() routine is available.\n\n\"derfc\"\nFrom derfc.U:\n\nThis variable conditionally defines the \"HASERFC\" symbol, which indicates to the C program\nthat the erfc() routine is available.\n\n\"deunice\"\nFrom Guess.U:\n\nThis variable conditionally defines the symbols \"EUNICE\" and \"VAX\", which alerts the C\nprogram that it must deal with idiosyncrasies of \"VMS\".\n\n\"dexp2\"\nFrom dexp2.U:\n\nThis variable conditionally defines the HASEXP2 symbol, which indicates to the C program\nthat the exp2() routine is available.\n\n\"dexpm1\"\nFrom dexpm1.U:\n\nThis variable conditionally defines the HASEXPM1 symbol, which indicates to the C program\nthat the expm1() routine is available.\n\n\"dfaststdio\"\nFrom dfaststdio.U:\n\nThis variable conditionally defines the \"HASFASTSTDIO\" symbol, which indicates to the C\nprogram that the \"fast stdio\" is available to manipulate the stdio buffers directly.\n\n\"dfchdir\"\nFrom dfchdir.U:\n\nThis variable conditionally defines the \"HASFCHDIR\" symbol, which indicates to the C\nprogram that the fchdir() routine is available.\n\n\"dfchmod\"\nFrom dfchmod.U:\n\nThis variable conditionally defines the \"HASFCHMOD\" symbol, which indicates to the C\nprogram that the fchmod() routine is available to change mode of opened files.\n\n\"dfchmodat\"\nFrom dfsat.U:\n\nThis variable conditionally defines the \"HASFCHMODAT\" symbol, which indicates the \"POSIX\"\nfchmodat() function is available.\n\n\"dfchown\"\nFrom dfchown.U:\n\nThis variable conditionally defines the \"HASFCHOWN\" symbol, which indicates to the C\nprogram that the fchown() routine is available to change ownership of opened files.\n\n\"dfcntl\"\nFrom dfcntl.U:\n\nThis variable conditionally defines the \"HASFCNTL\" symbol, and indicates whether the\nfcntl() function exists\n\n\"dfcntlcanlock\"\nFrom dfcntlcanlock.U:\n\nThis variable conditionally defines the \"FCNTLCANLOCK\" symbol and indicates whether file\nlocking with fcntl() works.\n\n\"dfdmacros\"\nFrom dfdset.U:\n\nThis variable contains the eventual value of the \"HASFDMACROS\" symbol, which indicates if\nyour C compiler knows about the macros which manipulate an fdset.\n\n\"dfdset\"\nFrom dfdset.U:\n\nThis variable contains the eventual value of the \"HASFDSET\" symbol, which indicates if\nyour C compiler knows about the fdset typedef.\n\n\"dfdclose\"\nFrom dfdclose.U:\n\nThis variable conditionally defines the \"HASFDCLOSE\" symbol, which indicates to the C\nprogram that the fdclose() routine is available.\n\n\"dfdim\"\nFrom dfdim.U:\n\nThis variable conditionally defines the \"HASFDIM\" symbol, which indicates to the C program\nthat the fdim() routine is available.\n\n\"dfdsbits\"\nFrom dfdset.U:\n\nThis variable contains the eventual value of the \"HASFDSBITS\" symbol, which indicates if\nyour fdset typedef contains the fdsbits member. If you have an fdset typedef, but the\ndweebs who installed it did a half-fast job and neglected to provide the macros to\nmanipulate an fdset, \"HASFDSBITS\" will let us know how to fix the gaffe.\n\n\"dfegetround\"\nFrom dfegetround.U:\n\nThis variable conditionally defines \"HASFEGETROUND\" if fegetround() is available to get the\nfloating point rounding mode.\n\n\"dfgetpos\"\nFrom dfgetpos.U:\n\nThis variable conditionally defines \"HASFGETPOS\" if fgetpos() is available to get the file\nposition indicator.\n\n\"dfinite\"\nFrom dfinite.U:\n\nThis variable conditionally defines the \"HASFINITE\" symbol, which indicates to the C\nprogram that the finite() routine is available.\n\n\"dfinitel\"\nFrom dfinitel.U:\n\nThis variable conditionally defines the \"HASFINITEL\" symbol, which indicates to the C\nprogram that the finitel() routine is available.\n\n\"dflexfnam\"\nFrom dflexfnam.U:\n\nThis variable conditionally defines the \"FLEXFILENAMES\" symbol, which indicates that the\nsystem supports filenames longer than 14 characters.\n\n\"dflock\"\nFrom dflock.U:\n\nThis variable conditionally defines \"HASFLOCK\" if flock() is available to do file locking.\n\n\"dflockproto\"\nFrom dflockproto.U:\n\nThis variable conditionally defines the \"HASFLOCKPROTO\" symbol, which indicates to the C\nprogram that the system provides a prototype for the flock() function. Otherwise, it is up\nto the program to supply one.\n\n\"dfma\"\nFrom dfma.U:\n\nThis variable conditionally defines the \"HASFMA\" symbol, which indicates to the C program\nthat the fma() routine is available.\n\n\"dfmax\"\nFrom dfmax.U:\n\nThis variable conditionally defines the \"HASFMAX\" symbol, which indicates to the C program\nthat the fmax() routine is available.\n\n\"dfmin\"\nFrom dfmin.U:\n\nThis variable conditionally defines the \"HASFMIN\" symbol, which indicates to the C program\nthat the fmin() routine is available.\n\n\"dfdopendir\"\nFrom dfdopendir.U:\n\nThis variable conditionally defines the \"HASFORK\" symbol, which indicates that the fdopen\nroutine is available to open a directory descriptor.\n\n\"dfork\"\nFrom dfork.U:\n\nThis variable conditionally defines the \"HASFORK\" symbol, which indicates to the C program\nthat the fork() routine is available.\n\n\"dfpclass\"\nFrom dfpclass.U:\n\nThis variable conditionally defines the \"HASFPCLASS\" symbol, which indicates to the C\nprogram that the fpclass() routine is available.\n\n\"dfpclassify\"\nFrom dfpclassify.U:\n\nThis variable conditionally defines the \"HASFPCLASSIFY\" symbol, which indicates to the C\nprogram that the fpclassify() routine is available.\n\n\"dfpclassl\"\nFrom dfpclassl.U:\n\nThis variable conditionally defines the \"HASFPCLASSL\" symbol, which indicates to the C\nprogram that the fpclassl() routine is available.\n\n\"dfpathconf\"\nFrom dpathconf.U:\n\nThis variable conditionally defines the \"HASFPATHCONF\" symbol, which indicates to the C\nprogram that the pathconf() routine is available to determine file-system related limits and\noptions associated with a given open file descriptor.\n\n\"dfpclass\"\nFrom dfpclass.U:\n\nThis variable conditionally defines the \"HASFPCLASS\" symbol, which indicates to the C\nprogram that the fpclass() routine is available.\n\n\"dfpclassify\"\nFrom dfpclassify.U:\n\nThis variable conditionally defines the \"HASFPCLASSIFY\" symbol, which indicates to the C\nprogram that the fpclassify() routine is available.\n\n\"dfpclassl\"\nFrom dfpclassl.U:\n\nThis variable conditionally defines the \"HASFPCLASSL\" symbol, which indicates to the C\nprogram that the fpclassl() routine is available.\n\n\"dfpgetround\"\nFrom dfpgetround.U:\n\nThis variable conditionally defines \"HASFPGETROUND\" if fpgetround() is available to get the\nfloating point rounding mode.\n\n\"dfpos64t\"\nFrom dfpos64t.U:\n\nThis symbol will be defined if the C compiler supports fpos64t.\n\n\"dfreelocale\"\nFrom dnewlocale.U:\n\nThis variable conditionally defines the \"HASFREELOCALE\" symbol, which indicates to the C\nprogram that the freelocale() routine is available to deallocates the resources associated\nwith a locale object.\n\n\"dfrexpl\"\nFrom dfrexpl.U:\n\nThis variable conditionally defines the \"HASFREXPL\" symbol, which indicates to the C\nprogram that the frexpl() routine is available.\n\n\"dfsdatas\"\nFrom dfsdatas.U:\n\nThis variable conditionally defines the \"HASSTRUCTFSDATA\" symbol, which indicates that\nthe struct fsdata is supported.\n\n\"dfseeko\"\nFrom dfseeko.U:\n\nThis variable conditionally defines the \"HASFSEEKO\" symbol, which indicates to the C\nprogram that the fseeko() routine is available.\n\n\"dfsetpos\"\nFrom dfsetpos.U:\n\nThis variable conditionally defines \"HASFSETPOS\" if fsetpos() is available to set the file\nposition indicator.\n\n\"dfstatfs\"\nFrom dfstatfs.U:\n\nThis variable conditionally defines the \"HASFSTATFS\" symbol, which indicates to the C\nprogram that the fstatfs() routine is available.\n\n\"dfstatvfs\"\nFrom dstatvfs.U:\n\nThis variable conditionally defines the \"HASFSTATVFS\" symbol, which indicates to the C\nprogram that the fstatvfs() routine is available.\n\n\"dfsync\"\nFrom dfsync.U:\n\nThis variable conditionally defines the \"HASFSYNC\" symbol, which indicates to the C program\nthat the fsync() routine is available.\n\n\"dftello\"\nFrom dftello.U:\n\nThis variable conditionally defines the \"HASFTELLO\" symbol, which indicates to the C\nprogram that the ftello() routine is available.\n\n\"dftime\"\nFrom dftime.U:\n\nThis variable conditionally defines the \"HASFTIME\" symbol, which indicates that the ftime()\nroutine exists. The ftime() routine is basically a sub-second accuracy clock.\n\n\"dfutimes\"\nFrom dfutimes.U:\n\nThis variable conditionally defines the \"HASFUTIMES\" symbol, which indicates to the C\nprogram that the futimes() routine is available.\n\n\"dgaistrerror\"\nFrom dgaistrerror.U:\n\nThis variable conditionally defines the \"HASGAISTRERROR\" symbol if the gaistrerror()\nroutine is available and can be used to translate error codes returned by getaddrinfo() into\nhuman readable strings.\n\n\"dGconvert\"\nFrom dgconvert.U:\n\nThis variable holds what Gconvert is defined as to convert floating point numbers into\nstrings. By default, Configure sets \"this\" macro to use the first of gconvert, gcvt, or\nsprintf that pass sprintf-%g-like behavior tests. If perl is using long doubles, the macro\nuses the first of the following functions that pass Configure's tests: qgcvt, sprintf (if\nConfigure knows how to make sprintf format long doubles--see sPRIgldbl), gconvert, gcvt, and\nsprintf (casting to double). The gconvertpreference and gconvertldpreference variables\ncan be used to alter Configure's preferences, for doubles and long doubles, respectively. If\npresent, they contain a space-separated list of one or more of the above function names in\nthe order they should be tried.\n\ndGconvert may be set to override Configure with a platform- specific function. If this\nfunction expects a double, a different value may need to be set by the uselongdouble.cbu\ncall-back unit so that long doubles can be formatted without loss of precision.\n\n\"dgdbmndbmhusesprototypes\"\nFrom indbm.U:\n\nThis variable conditionally defines the \"NDBMHUSESPROTOTYPES\" symbol, which indicates\nthat the gdbm-ndbm.h include file uses real \"ANSI\" C prototypes instead of K&R style\nfunction declarations. K&R style declarations are unsupported in C++, so the include file\nrequires special handling when using a C++ compiler and this variable is undefined. Consult\nthe different d*ndbmhusesprototypes variables to get the same information for\nalternative ndbm.h include files.\n\n\"dgdbmndbmhusesprototypes\"\nFrom indbm.U:\n\nThis variable conditionally defines the \"NDBMHUSESPROTOTYPES\" symbol, which indicates\nthat the gdbm/ndbm.h include file uses real \"ANSI\" C prototypes instead of K&R style\nfunction declarations. K&R style declarations are unsupported in C++, so the include file\nrequires special handling when using a C++ compiler and this variable is undefined. Consult\nthe different d*ndbmhusesprototypes variables to get the same information for\nalternative ndbm.h include files.\n\n\"dgetaddrinfo\"\nFrom dgetaddrinfo.U:\n\nThis variable conditionally defines the \"HASGETADDRINFO\" symbol, which indicates to the C\nprogram that the getaddrinfo() function is available.\n\n\"dgetcwd\"\nFrom dgetcwd.U:\n\nThis variable conditionally defines the \"HASGETCWD\" symbol, which indicates to the C\nprogram that the getcwd() routine is available to get the current working directory.\n\n\"dgetenvpreservesotherthread\"\nFrom dgetenvthread.U:\n\nThis variable conditionally defines the \"GETENVPRESERVESOTHERTHREAD\" symbol, which\nindicates to the C program that the getenv() system call does not zap the static buffer in a\ndifferent thread.\n\n\"dgetespwnam\"\nFrom dgetespwnam.U:\n\nThis variable conditionally defines \"HASGETESPWNAM\" if getespwnam() is available to\nretrieve enhanced (shadow) password entries by name.\n\n\"dgetfsstat\"\nFrom dgetfsstat.U:\n\nThis variable conditionally defines the \"HASGETFSSTAT\" symbol, which indicates to the C\nprogram that the getfsstat() routine is available.\n\n\"dgetgrent\"\nFrom dgetgrent.U:\n\nThis variable conditionally defines the \"HASGETGRENT\" symbol, which indicates to the C\nprogram that the getgrent() routine is available for sequential access of the group\ndatabase.\n\n\"dgetgrentr\"\nFrom dgetgrentr.U:\n\nThis variable conditionally defines the \"HASGETGRENTR\" symbol, which indicates to the C\nprogram that the getgrentr() routine is available.\n\n\"dgetgrgidr\"\nFrom dgetgrgidr.U:\n\nThis variable conditionally defines the \"HASGETGRGIDR\" symbol, which indicates to the C\nprogram that the getgrgidr() routine is available.\n\n\"dgetgrnamr\"\nFrom dgetgrnamr.U:\n\nThis variable conditionally defines the \"HASGETGRNAMR\" symbol, which indicates to the C\nprogram that the getgrnamr() routine is available.\n\n\"dgetgrps\"\nFrom dgetgrps.U:\n\nThis variable conditionally defines the \"HASGETGROUPS\" symbol, which indicates to the C\nprogram that the getgroups() routine is available to get the list of process groups.\n\n\"dgethbyaddr\"\nFrom dgethbyad.U:\n\nThis variable conditionally defines the \"HASGETHOSTBYADDR\" symbol, which indicates to the C\nprogram that the gethostbyaddr() routine is available to look up hosts by their \"IP\"\naddresses.\n\n\"dgethbyname\"\nFrom dgethbynm.U:\n\nThis variable conditionally defines the \"HASGETHOSTBYNAME\" symbol, which indicates to the C\nprogram that the gethostbyname() routine is available to look up host names in some data\nbase or other.\n\n\"dgethent\"\nFrom dgethent.U:\n\nThis variable conditionally defines \"HASGETHOSTENT\" if gethostent() is available to look up\nhost names in some data base or another.\n\n\"dgethname\"\nFrom dgethname.U:\n\nThis variable conditionally defines the \"HASGETHOSTNAME\" symbol, which indicates to the C\nprogram that the gethostname() routine may be used to derive the host name.\n\n\"dgethostbyaddrr\"\nFrom dgethostbyaddrr.U:\n\nThis variable conditionally defines the \"HASGETHOSTBYADDRR\" symbol, which indicates to the\nC program that the gethostbyaddrr() routine is available.\n\n\"dgethostbynamer\"\nFrom dgethostbynamer.U:\n\nThis variable conditionally defines the \"HASGETHOSTBYNAMER\" symbol, which indicates to the\nC program that the gethostbynamer() routine is available.\n\n\"dgethostentr\"\nFrom dgethostentr.U:\n\nThis variable conditionally defines the \"HASGETHOSTENTR\" symbol, which indicates to the C\nprogram that the gethostentr() routine is available.\n\n\"dgethostprotos\"\nFrom dgethostprotos.U:\n\nThis variable conditionally defines the \"HASGETHOSTPROTOS\" symbol, which indicates to the\nC program that supplies prototypes for the various gethost*() functions. See also\nnetdbtype.U for probing for various netdb types.\n\n\"dgetitimer\"\nFrom dgetitimer.U:\n\nThis variable conditionally defines the \"HASGETITIMER\" symbol, which indicates to the C\nprogram that the getitimer() routine is available.\n\n\"dgetlogin\"\nFrom dgetlogin.U:\n\nThis variable conditionally defines the \"HASGETLOGIN\" symbol, which indicates to the C\nprogram that the getlogin() routine is available to get the login name.\n\n\"dgetloginr\"\nFrom dgetloginr.U:\n\nThis variable conditionally defines the \"HASGETLOGINR\" symbol, which indicates to the C\nprogram that the getloginr() routine is available.\n\n\"dgetmnt\"\nFrom dgetmnt.U:\n\nThis variable conditionally defines the \"HASGETMNT\" symbol, which indicates to the C\nprogram that the getmnt() routine is available to retrieve one or more mount info blocks by\nfilename.\n\n\"dgetmntent\"\nFrom dgetmntent.U:\n\nThis variable conditionally defines the \"HASGETMNTENT\" symbol, which indicates to the C\nprogram that the getmntent() routine is available to iterate through mounted files to get\ntheir mount info.\n\n\"dgetnameinfo\"\nFrom dgetnameinfo.U:\n\nThis variable conditionally defines the \"HASGETNAMEINFO\" symbol, which indicates to the C\nprogram that the getnameinfo() function is available.\n\n\"dgetnbyaddr\"\nFrom dgetnbyad.U:\n\nThis variable conditionally defines the \"HASGETNETBYADDR\" symbol, which indicates to the C\nprogram that the getnetbyaddr() routine is available to look up networks by their \"IP\"\naddresses.\n\n\"dgetnbyname\"\nFrom dgetnbynm.U:\n\nThis variable conditionally defines the \"HASGETNETBYNAME\" symbol, which indicates to the C\nprogram that the getnetbyname() routine is available to look up networks by their names.\n\n\"dgetnent\"\nFrom dgetnent.U:\n\nThis variable conditionally defines \"HASGETNETENT\" if getnetent() is available to look up\nnetwork names in some data base or another.\n\n\"dgetnetbyaddrr\"\nFrom dgetnetbyaddrr.U:\n\nThis variable conditionally defines the \"HASGETNETBYADDRR\" symbol, which indicates to the\nC program that the getnetbyaddrr() routine is available.\n\n\"dgetnetbynamer\"\nFrom dgetnetbynamer.U:\n\nThis variable conditionally defines the \"HASGETNETBYNAMER\" symbol, which indicates to the\nC program that the getnetbynamer() routine is available.\n\n\"dgetnetentr\"\nFrom dgetnetentr.U:\n\nThis variable conditionally defines the \"HASGETNETENTR\" symbol, which indicates to the C\nprogram that the getnetentr() routine is available.\n\n\"dgetnetprotos\"\nFrom dgetnetprotos.U:\n\nThis variable conditionally defines the \"HASGETNETPROTOS\" symbol, which indicates to the C\nprogram that supplies prototypes for the various getnet*() functions. See also\nnetdbtype.U for probing for various netdb types.\n\n\"dgetpagsz\"\nFrom dgetpagsz.U:\n\nThis variable conditionally defines \"HASGETPAGESIZE\" if getpagesize() is available to get\nthe system page size.\n\n\"dgetpbyname\"\nFrom dgetprotby.U:\n\nThis variable conditionally defines the \"HASGETPROTOBYNAME\" symbol, which indicates to the\nC program that the getprotobyname() routine is available to look up protocols by their name.\n\n\"dgetpbynumber\"\nFrom dgetprotby.U:\n\nThis variable conditionally defines the \"HASGETPROTOBYNUMBER\" symbol, which indicates to\nthe C program that the getprotobynumber() routine is available to look up protocols by their\nnumber.\n\n\"dgetpent\"\nFrom dgetpent.U:\n\nThis variable conditionally defines \"HASGETPROTOENT\" if getprotoent() is available to look\nup protocols in some data base or another.\n\n\"dgetpgid\"\nFrom dgetpgid.U:\n\nThis variable conditionally defines the \"HASGETPGID\" symbol, which indicates to the C\nprogram that the getpgid(pid) function is available to get the process group id.\n\n\"dgetpgrp\"\nFrom dgetpgrp.U:\n\nThis variable conditionally defines \"HASGETPGRP\" if getpgrp() is available to get the\ncurrent process group.\n\n\"dgetpgrp2\"\nFrom dgetpgrp2.U:\n\nThis variable conditionally defines the HASGETPGRP2 symbol, which indicates to the C\nprogram that the getpgrp2() (as in DG/\"UX\") routine is available to get the current process\ngroup.\n\n\"dgetppid\"\nFrom dgetppid.U:\n\nThis variable conditionally defines the \"HASGETPPID\" symbol, which indicates to the C\nprogram that the getppid() routine is available to get the parent process \"ID\".\n\n\"dgetprior\"\nFrom dgetprior.U:\n\nThis variable conditionally defines \"HASGETPRIORITY\" if getpriority() is available to get a\nprocess's priority.\n\n\"dgetprotobynamer\"\nFrom dgetprotobynamer.U:\n\nThis variable conditionally defines the \"HASGETPROTOBYNAMER\" symbol, which indicates to\nthe C program that the getprotobynamer() routine is available.\n\n\"dgetprotobynumberr\"\nFrom dgetprotobynumberr.U:\n\nThis variable conditionally defines the \"HASGETPROTOBYNUMBERR\" symbol, which indicates to\nthe C program that the getprotobynumberr() routine is available.\n\n\"dgetprotoentr\"\nFrom dgetprotoentr.U:\n\nThis variable conditionally defines the \"HASGETPROTOENTR\" symbol, which indicates to the C\nprogram that the getprotoentr() routine is available.\n\n\"dgetprotoprotos\"\nFrom dgetprotoprotos.U:\n\nThis variable conditionally defines the \"HASGETPROTOPROTOS\" symbol, which indicates to the\nC program that supplies prototypes for the various getproto*() functions. See also\nnetdbtype.U for probing for various netdb types.\n\n\"dgetprpwnam\"\nFrom dgetprpwnam.U:\n\nThis variable conditionally defines \"HASGETPRPWNAM\" if getprpwnam() is available to\nretrieve protected (shadow) password entries by name.\n\n\"dgetpwent\"\nFrom dgetpwent.U:\n\nThis variable conditionally defines the \"HASGETPWENT\" symbol, which indicates to the C\nprogram that the getpwent() routine is available for sequential access of the passwd\ndatabase.\n\n\"dgetpwentr\"\nFrom dgetpwentr.U:\n\nThis variable conditionally defines the \"HASGETPWENTR\" symbol, which indicates to the C\nprogram that the getpwentr() routine is available.\n\n\"dgetpwnamr\"\nFrom dgetpwnamr.U:\n\nThis variable conditionally defines the \"HASGETPWNAMR\" symbol, which indicates to the C\nprogram that the getpwnamr() routine is available.\n\n\"dgetpwuidr\"\nFrom dgetpwuidr.U:\n\nThis variable conditionally defines the \"HASGETPWUIDR\" symbol, which indicates to the C\nprogram that the getpwuidr() routine is available.\n\n\"dgetsbyname\"\nFrom dgetsrvby.U:\n\nThis variable conditionally defines the \"HASGETSERVBYNAME\" symbol, which indicates to the C\nprogram that the getservbyname() routine is available to look up services by their name.\n\n\"dgetsbyport\"\nFrom dgetsrvby.U:\n\nThis variable conditionally defines the \"HASGETSERVBYPORT\" symbol, which indicates to the C\nprogram that the getservbyport() routine is available to look up services by their port.\n\n\"dgetsent\"\nFrom dgetsent.U:\n\nThis variable conditionally defines \"HASGETSERVENT\" if getservent() is available to look up\nnetwork services in some data base or another.\n\n\"dgetservbynamer\"\nFrom dgetservbynamer.U:\n\nThis variable conditionally defines the \"HASGETSERVBYNAMER\" symbol, which indicates to the\nC program that the getservbynamer() routine is available.\n\n\"dgetservbyportr\"\nFrom dgetservbyportr.U:\n\nThis variable conditionally defines the \"HASGETSERVBYPORTR\" symbol, which indicates to the\nC program that the getservbyportr() routine is available.\n\n\"dgetserventr\"\nFrom dgetserventr.U:\n\nThis variable conditionally defines the \"HASGETSERVENTR\" symbol, which indicates to the C\nprogram that the getserventr() routine is available.\n\n\"dgetservprotos\"\nFrom dgetservprotos.U:\n\nThis variable conditionally defines the \"HASGETSERVPROTOS\" symbol, which indicates to the\nC program that supplies prototypes for the various getserv*() functions. See also\nnetdbtype.U for probing for various netdb types.\n\n\"dgetspnam\"\nFrom dgetspnam.U:\n\nThis variable conditionally defines \"HASGETSPNAM\" if getspnam() is available to retrieve\nSysV shadow password entries by name.\n\n\"dgetspnamr\"\nFrom dgetspnamr.U:\n\nThis variable conditionally defines the \"HASGETSPNAMR\" symbol, which indicates to the C\nprogram that the getspnamr() routine is available.\n\n\"dgettimeod\"\nFrom dftime.U:\n\nThis variable conditionally defines the \"HASGETTIMEOFDAY\" symbol, which indicates that the\ngettimeofday() system call exists (to obtain a sub-second accuracy clock). You should\nprobably include .\n\n\"dgmtime64\"\nFrom dtimefuncs64.U:\n\nThis variable conditionally defines the HASGMTIME64 symbol, which indicates to the C\nprogram that the gmtime64 () routine is available.\n\n\"dgmtimer\"\nFrom dgmtimer.U:\n\nThis variable conditionally defines the \"HASGMTIMER\" symbol, which indicates to the C\nprogram that the gmtimer() routine is available.\n\n\"dgnulibc\"\nFrom dgnulibc.U:\n\nDefined if we're dealing with the \"GNU\" C Library.\n\n\"dgrpasswd\"\nFrom igrp.U:\n\nThis variable conditionally defines \"GRPASSWD\", which indicates that struct group in \ncontains grpasswd.\n\n\"dhasCUTF8\"\nFrom dsetlocale.U:\n\nThis variable is set to either \"true\" or \"false\" depending on whether the compilation system\nsupports the C.UTF-8 locale.\n\n\"dhasmntopt\"\nFrom dhasmntopt.U:\n\nThis variable conditionally defines the \"HASHASMNTOPT\" symbol, which indicates to the C\nprogram that the hasmntopt() routine is available to query the mount options of file\nsystems.\n\n\"dhtonl\"\nFrom dhtonl.U:\n\nThis variable conditionally defines \"HASHTONL\" if htonl() and its friends are available to\ndo network order byte swapping.\n\n\"dhypot\"\nFrom dhypot.U:\n\nThis variable conditionally defines \"HASHYPOT\" if hypot is available for numerically stable\nhypotenuse function.\n\n\"dilogb\"\nFrom dilogb.U:\n\nThis variable conditionally defines the \"HASILOGB\" symbol, which indicates to the C program\nthat the ilogb() routine is available for extracting the exponent of double x as a signed\ninteger.\n\n\"dilogbl\"\nFrom dilogbl.U:\n\nThis variable conditionally defines the \"HASILOGBL\" symbol, which indicates to the C\nprogram that the ilogbl() routine is available for extracting the exponent of long double x\nas a signed integer. If scalbnl is also present we can emulate frexpl.\n\n\"dincversionlist\"\nFrom incversionlist.U:\n\nThis variable conditionally defines \"PERLINCVERSIONLIST\". It is set to undef when\n\"PERLINCVERSIONLIST\" is empty.\n\n\"dinetaton\"\nFrom dinetaton.U:\n\nThis variable conditionally defines the \"HASINETATON\" symbol, which indicates to the C\nprogram that the inetaton() function is available to parse \"IP\" address \"dotted-quad\"\nstrings.\n\n\"dinetntop\"\nFrom dinetntop.U:\n\nThis variable conditionally defines the \"HASINETNTOP\" symbol, which indicates to the C\nprogram that the inetntop() function is available.\n\n\"dinetpton\"\nFrom dinetpton.U:\n\nThis variable conditionally defines the \"HASINETPTON\" symbol, which indicates to the C\nprogram that the inetpton() function is available.\n\n\"dint64t\"\nFrom dint64t.U:\n\nThis symbol will be defined if the C compiler supports int64t.\n\n\"dipmreq\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASIPMREQ\" symbol, which indicates the\navailability of a struct ipmreq.\n\n\"dipmreqsource\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASIPMREQSOURCE\" symbol, which indicates the\navailability of a struct ipmreqsource.\n\n\"dipv6mreq\"\nFrom dsocket.U:\n\nThis variable conditionally defines the HASIPV6MREQ symbol, which indicates the\navailability of a struct ipv6mreq.\n\n\"dipv6mreqsource\"\nFrom dsocket.U:\n\nThis variable conditionally defines the HASIPV6MREQSOURCE symbol, which indicates the\navailability of a struct ipv6mreqsource.\n\n\"disascii\"\nFrom disascii.U:\n\nThis variable conditionally defines the \"HASISASCII\" constant, which indicates to the C\nprogram that isascii() is available.\n\n\"disblank\"\nFrom disblank.U:\n\nThis variable conditionally defines the \"HASISBLANK\" constant, which indicates to the C\nprogram that isblank() is available.\n\n\"disfinite\"\nFrom disfinite.U:\n\nThis variable conditionally defines the \"HASISFINITE\" symbol, which indicates to the C\nprogram that the isfinite() routine is available.\n\n\"disfinitel\"\nFrom disfinitel.U:\n\nThis variable conditionally defines the \"HASISFINITEL\" symbol, which indicates to the C\nprogram that the isfinitel() routine is available.\n\n\"disinf\"\nFrom disinf.U:\n\nThis variable conditionally defines the \"HASISINF\" symbol, which indicates to the C program\nthat the isinf() routine is available.\n\n\"disinfl\"\nFrom disinfl.U:\n\nThis variable conditionally defines the \"HASISINFL\" symbol, which indicates to the C\nprogram that the isinfl() routine is available.\n\n\"disless\"\nFrom disless.U:\n\nThis variable conditionally defines the \"HASISLESS\" symbol, which indicates to the C\nprogram that the isless() routine is available.\n\n\"disnan\"\nFrom disnan.U:\n\nThis variable conditionally defines the \"HASISNAN\" symbol, which indicates to the C program\nthat the isnan() routine is available.\n\n\"disnanl\"\nFrom disnanl.U:\n\nThis variable conditionally defines the \"HASISNANL\" symbol, which indicates to the C\nprogram that the isnanl() routine is available.\n\n\"disnormal\"\nFrom disnormal.U:\n\nThis variable conditionally defines the \"HASISNORMAL\" symbol, which indicates to the C\nprogram that the isnormal() routine is available.\n\n\"dj0\"\nFrom dj0.U:\n\nThis variable conditionally defines the HASJ0 symbol, which indicates to the C program that\nthe j0() routine is available.\n\n\"dj0l\"\nFrom dj0.U:\n\nThis variable conditionally defines the HASJ0L symbol, which indicates to the C program\nthat the j0l() routine is available.\n\n\"dkillpg\"\nFrom dkillpg.U:\n\nThis variable conditionally defines the \"HASKILLPG\" symbol, which indicates to the C\nprogram that the killpg() routine is available to kill process groups.\n\n\"dlcmonetary2008\"\nFrom dlcmonetary2008.U:\n\nThis variable conditionally defines HASLCMONETARY2008 if libc has the international\ncurrency locale rules from \"POSIX\" 1003.1-2008.\n\n\"dlchown\"\nFrom dlchown.U:\n\nThis variable conditionally defines the \"HASLCHOWN\" symbol, which indicates to the C\nprogram that the lchown() routine is available to operate on a symbolic link (instead of\nfollowing the link).\n\n\"dldbldig\"\nFrom dldbldig.U:\n\nThis variable conditionally defines dldbldig if this system's header files provide\n\"LDBLDIG\", which is the number of significant digits in a long double precision number.\n\n\"dldexpl\"\nFrom dlongdbl.U:\n\nThis variable conditionally defines the \"HASLDEXPL\" symbol, which indicates to the C\nprogram that the ldexpl() routine is available.\n\n\"dlgamma\"\nFrom dlgamma.U:\n\nThis variable conditionally defines the \"HASLGAMMA\" symbol, which indicates to the C\nprogram that the lgamma() routine is available for the log gamma function. See also dtgamma\nand dlgammar.\n\n\"dlgammar\"\nFrom dlgammar.U:\n\nThis variable conditionally defines the \"HASLGAMMAR\" symbol, which indicates to the C\nprogram that the lgammar() routine is available for the log gamma function, without using\nthe global signgam variable.\n\n\"dlibmlibversion\"\nFrom dlibmlibversion.U:\n\nThis variable conditionally defines the \"LIBMLIBVERSION\" symbol, which indicates to the C\nprogram that math.h defines \"LIBVERSION\" being available in libm\n\n\"dlibnameunique\"\nFrom so.U:\n\nThis variable is defined if the target system insists on unique basenames for shared library\nfiles. This is currently true on Android, false everywhere else we know of. Defaults to\n\"undef\".\n\n\"dlink\"\nFrom dlink.U:\n\nThis variable conditionally defines \"HASLINK\" if link() is available to create hard links.\n\n\"dlinkat\"\nFrom dfsat.U:\n\nThis variable conditionally defines the \"HASLINKAT\" symbol, which indicates the \"POSIX\"\nlinkat() function is available.\n\n\"dllrint\"\nFrom dllrint.U:\n\nThis variable conditionally defines the \"HASLLRINT\" symbol, which indicates to the C\nprogram that the llrint() routine is available to return the long long value closest to a\ndouble (according to the current rounding mode).\n\n\"dllrintl\"\nFrom dllrintl.U:\n\nThis variable conditionally defines the \"HASLLRINTL\" symbol, which indicates to the C\nprogram that the llrintl() routine is available to return the long long value closest to a\nlong double (according to the current rounding mode).\n\n\"dllround\"\nFrom dllround.U:\n\nThis variable conditionally defines the \"HASLLROUND\" symbol, which indicates to the C\nprogram that the llround() routine is available to return the long long value nearest to x.\n\n\"dllroundl\"\nFrom dllroundl.U:\n\nThis variable conditionally defines the \"HASLLROUNDL\" symbol, which indicates to the C\nprogram that the llroundl() routine is available to return the long long value nearest to x\naway from zero.\n\n\"dlocaleconvl\"\nFrom dlocaleconvl.U:\n\nThis variable conditionally defines the \"HASLOCALECONVL\" symbol, which indicates to the C\nprogram that the localeconvl() routine is available.\n\n\"dlocaltime64\"\nFrom dtimefuncs64.U:\n\nThis variable conditionally defines the HASLOCALTIME64 symbol, which indicates to the C\nprogram that the localtime64 () routine is available.\n\n\"dlocaltimer\"\nFrom dlocaltimer.U:\n\nThis variable conditionally defines the \"HASLOCALTIMER\" symbol, which indicates to the C\nprogram that the localtimer() routine is available.\n\n\"dlocaltimerneedstzset\"\nFrom dlocaltimer.U:\n\nThis variable conditionally defines the \"LOCALTIMERNEEDSTZSET\" symbol, which makes us\ncall tzset before localtimer()\n\n\"dlocconv\"\nFrom dlocconv.U:\n\nThis variable conditionally defines \"HASLOCALECONV\" if localeconv() is available for\nnumeric and monetary formatting conventions.\n\n\"dlockf\"\nFrom dlockf.U:\n\nThis variable conditionally defines \"HASLOCKF\" if lockf() is available to do file locking.\n\n\"dlog1p\"\nFrom dlog1p.U:\n\nThis variable conditionally defines the HASLOG1P symbol, which indicates to the C program\nthat the logp1() routine is available to compute log(1 + x) for values of x close to zero.\n\n\"dlog2\"\nFrom dlog2.U:\n\nThis variable conditionally defines the HASLOG2 symbol, which indicates to the C program\nthat the log2() routine is available to compute log base two.\n\n\"dlogb\"\nFrom dlogb.U:\n\nThis variable conditionally defines the \"HASLOGB\" symbol, which indicates to the C program\nthat the logb() routine is available to extract the exponent of x.\n\n\"dlongdoublestyleieee\"\nFrom dlongdbl.U:\n\nThis variable conditionally defines \"LONGDOUBLESTYLEIEEE\" if the long double is any of\nthe \"IEEE\" 754 style long doubles: \"LONGDOUBLESTYLEIEEESTD\",\n\"LONGDOUBLESTYLEIEEEEXTENDED\", \"LONGDOUBLESTYLEIEEEDOUBLEDOUBLE\".\n\n\"dlongdoublestyleieeedoubledouble\"\nFrom dlongdbl.U:\n\nThis variable conditionally defines \"LONGDOUBLESTYLEIEEEDOUBLEDOUBLE\" if the long double\nis the 128-bit \"IEEE\" 754 double-double.\n\n\"dlongdoublestyleieeeextended\"\nFrom dlongdbl.U:\n\nThis variable conditionally defines \"LONGDOUBLESTYLEIEEEEXTENDED\" if the long double is\nthe 80-bit \"IEEE\" 754 extended precision. Note that despite the \"extended\" this is less than\nthe \"std\", since this is an extension of the double precision.\n\n\"dlongdoublestyleieeestd\"\nFrom dlongdbl.U:\n\nThis variable conditionally defines \"LONGDOUBLESTYLEIEEESTD\" if the long double is the\n128-bit \"IEEE\" 754.\n\n\"dlongdoublestylevax\"\nFrom dlongdbl.U:\n\nThis variable conditionally defines \"LONGDOUBLESTYLEVAX\" if the long double is the\n128-bit \"VAX\" format H.\n\n\"dlongdbl\"\nFrom dlongdbl.U:\n\nThis variable conditionally defines \"HASLONGDOUBLE\" if the long double type is supported.\n\n\"dlonglong\"\nFrom dlonglong.U:\n\nThis variable conditionally defines \"HASLONGLONG\" if the long long type is supported.\n\n\"dlrint\"\nFrom dlrint.U:\n\nThis variable conditionally defines the \"HASLRINT\" symbol, which indicates to the C program\nthat the lrint() routine is available to return the integral value closest to a double\n(according to the current rounding mode).\n\n\"dlrintl\"\nFrom dlrintl.U:\n\nThis variable conditionally defines the \"HASLRINTL\" symbol, which indicates to the C\nprogram that the lrintl() routine is available to return the integral value closest to a\nlong double (according to the current rounding mode).\n\n\"dlround\"\nFrom dlround.U:\n\nThis variable conditionally defines the \"HASLROUND\" symbol, which indicates to the C\nprogram that the lround() routine is available to return the integral value nearest to x.\n\n\"dlroundl\"\nFrom dlroundl.U:\n\nThis variable conditionally defines the \"HASLROUNDL\" symbol, which indicates to the C\nprogram that the lroundl() routine is available to return the integral value nearest to x\naway from zero.\n\n\"dlseekproto\"\nFrom dlseekproto.U:\n\nThis variable conditionally defines the \"HASLSEEKPROTO\" symbol, which indicates to the C\nprogram that the system provides a prototype for the lseek() function. Otherwise, it is up\nto the program to supply one.\n\n\"dlstat\"\nFrom dlstat.U:\n\nThis variable conditionally defines \"HASLSTAT\" if lstat() is available to do file stats on\nsymbolic links.\n\n\"dmadvise\"\nFrom dmadvise.U:\n\nThis variable conditionally defines \"HASMADVISE\" if madvise() is available to map a file\ninto memory.\n\n\"dmallocgoodsize\"\nFrom dmallocsize.U:\n\nThis symbol, if defined, indicates that the mallocgoodsize routine is available for use.\n\n\"dmallocsize\"\nFrom dmallocsize.U:\n\nThis symbol, if defined, indicates that the mallocsize routine is available for use.\n\n\"dmallocusablesize\"\nFrom dmallocsize.U:\n\nThis symbol, if defined, indicates that the mallocusablesize routine is available for use.\n\n\"dmblen\"\nFrom dmblen.U:\n\nThis variable conditionally defines the \"HASMBLEN\" symbol, which indicates to the C program\nthat the mblen() routine is available to find the number of bytes in a multibyte character.\n\n\"dmbrlen\"\nFrom dmbrlen.U:\n\nThis variable conditionally defines the \"HASMBRLEN\" symbol if the mbrlen() routine is\navailable to be used to get the length of multi-byte character strings.\n\n\"dmbrtowc\"\nFrom dmbrtowc.U:\n\nThis variable conditionally defines the \"HASMBRTOWC\" symbol if the mbrtowc() routine is\navailable to be used to convert a multi-byte character into a wide character.\n\n\"dmbstowcs\"\nFrom dmbstowcs.U:\n\nThis variable conditionally defines the \"HASMBSTOWCS\" symbol, which indicates to the C\nprogram that the mbstowcs() routine is available to convert a multibyte string into a wide\ncharacter string.\n\n\"dmbtowc\"\nFrom dmbtowc.U:\n\nThis variable conditionally defines the \"HASMBTOWC\" symbol, which indicates to the C\nprogram that the mbtowc() routine is available to convert multibyte to a wide character.\n\n\"dmemmem\"\nFrom dmemmem.U:\n\nThis variable conditionally defines the \"HASMEMMEM\" symbol, which indicates to the C\nprogram that the memmem() routine is available to return a pointer to the start of the first\noccurrence of a substring in a memory area (or \"NULL\" if not found).\n\n\"dmemrchr\"\nFrom dmemrchr.U:\n\nThis variable conditionally defines the \"HASMEMRCHR\" symbol, which indicates to the C\nprogram that the memrchr() routine is available to return a pointer to the last occurrence\nof a byte in a memory area (or \"NULL\" if not found).\n\n\"dmkdir\"\nFrom dmkdir.U:\n\nThis variable conditionally defines the \"HASMKDIR\" symbol, which indicates to the C program\nthat the mkdir() routine is available to create directories..\n\n\"dmkdtemp\"\nFrom dmkdtemp.U:\n\nThis variable conditionally defines the \"HASMKDTEMP\" symbol, which indicates to the C\nprogram that the mkdtemp() routine is available to exclusively create a uniquely named\ntemporary directory.\n\n\"dmkfifo\"\nFrom dmkfifo.U:\n\nThis variable conditionally defines the \"HASMKFIFO\" symbol, which indicates to the C\nprogram that the mkfifo() routine is available.\n\n\"dmkostemp\"\nFrom dmkostemp.U:\n\nThis variable conditionally defines \"HASMKOSTEMP\" if mkostemp() is available to exclusively\ncreate and open a uniquely named (with a suffix) temporary file.\n\n\"dmkstemp\"\nFrom dmkstemp.U:\n\nThis variable conditionally defines the \"HASMKSTEMP\" symbol, which indicates to the C\nprogram that the mkstemp() routine is available to exclusively create and open a uniquely\nnamed temporary file.\n\n\"dmkstemps\"\nFrom dmkstemps.U:\n\nThis variable conditionally defines the \"HASMKSTEMPS\" symbol, which indicates to the C\nprogram that the mkstemps() routine is available to exclusively create and open a uniquely\nnamed (with a suffix) temporary file.\n\n\"dmktime\"\nFrom dmktime.U:\n\nThis variable conditionally defines the \"HASMKTIME\" symbol, which indicates to the C\nprogram that the mktime() routine is available.\n\n\"dmktime64\"\nFrom dtimefuncs64.U:\n\nThis variable conditionally defines the HASMKTIME64 symbol, which indicates to the C\nprogram that the mktime64 () routine is available.\n\n\"dmmap\"\nFrom dmmap.U:\n\nThis variable conditionally defines \"HASMMAP\" if mmap() is available to map a file into\nmemory.\n\n\"dmodfl\"\nFrom dmodfl.U:\n\nThis variable conditionally defines the \"HASMODFL\" symbol, which indicates to the C program\nthat the modfl() routine is available.\n\n\"dmodflproto\"\nFrom dmodfl.U:\n\nThis symbol, if defined, indicates that the system provides a prototype for the modfl()\nfunction. Otherwise, it is up to the program to supply one. C99 says it should be long\ndouble modfl(long double, long double *);\n\n\"dmprotect\"\nFrom dmprotect.U:\n\nThis variable conditionally defines \"HASMPROTECT\" if mprotect() is available to modify the\naccess protection of a memory mapped file.\n\n\"dmsg\"\nFrom dmsg.U:\n\nThis variable conditionally defines the \"HASMSG\" symbol, which indicates that the entire\nmsg*(2) library is present.\n\n\"dmsgctrunc\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASMSGCTRUNC\" symbol, which indicates that the\n\"MSGCTRUNC\" is available. #ifdef is not enough because it may be an enum, glibc has been\nknown to do this.\n\n\"dmsgdontroute\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASMSGDONTROUTE\" symbol, which indicates that the\n\"MSGDONTROUTE\" is available. #ifdef is not enough because it may be an enum, glibc has been\nknown to do this.\n\n\"dmsgoob\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASMSGOOB\" symbol, which indicates that the\n\"MSGOOB\" is available. #ifdef is not enough because it may be an enum, glibc has been known\nto do this.\n\n\"dmsgpeek\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASMSGPEEK\" symbol, which indicates that the\n\"MSGPEEK\" is available. #ifdef is not enough because it may be an enum, glibc has been\nknown to do this.\n\n\"dmsgproxy\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASMSGPROXY\" symbol, which indicates that the\n\"MSGPROXY\" is available. #ifdef is not enough because it may be an enum, glibc has been\nknown to do this.\n\n\"dmsgctl\"\nFrom dmsgctl.U:\n\nThis variable conditionally defines the \"HASMSGCTL\" symbol, which indicates to the C\nprogram that the msgctl() routine is available.\n\n\"dmsgget\"\nFrom dmsgget.U:\n\nThis variable conditionally defines the \"HASMSGGET\" symbol, which indicates to the C\nprogram that the msgget() routine is available.\n\n\"dmsghdrs\"\nFrom dmsghdrs.U:\n\nThis variable conditionally defines the \"HASSTRUCTMSGHDR\" symbol, which indicates that the\nstruct msghdr is supported.\n\n\"dmsgrcv\"\nFrom dmsgrcv.U:\n\nThis variable conditionally defines the \"HASMSGRCV\" symbol, which indicates to the C\nprogram that the msgrcv() routine is available.\n\n\"dmsgsnd\"\nFrom dmsgsnd.U:\n\nThis variable conditionally defines the \"HASMSGSND\" symbol, which indicates to the C\nprogram that the msgsnd() routine is available.\n\n\"dmsync\"\nFrom dmsync.U:\n\nThis variable conditionally defines \"HASMSYNC\" if msync() is available to synchronize a\nmapped file.\n\n\"dmunmap\"\nFrom dmunmap.U:\n\nThis variable conditionally defines \"HASMUNMAP\" if munmap() is available to unmap a region\nmapped by mmap().\n\n\"dmymalloc\"\nFrom mallocsrc.U:\n\nThis variable conditionally defines \"MYMALLOC\" in case other parts of the source want to\ntake special action if \"MYMALLOC\" is used. This may include different sorts of profiling or\nerror detection.\n\n\"dnan\"\nFrom dnan.U:\n\nThis variable conditionally defines \"HASNAN\" if nan() is available to generate NaN.\n\n\"dnanosleep\"\nFrom dnanosleep.U:\n\nThis variable conditionally defines \"HASNANOSLEEP\" if nanosleep() is available to sleep\nwith 1E-9 sec accuracy.\n\n\"dndbm\"\nFrom indbm.U:\n\nThis variable conditionally defines the \"HASNDBM\" symbol, which indicates that both the\nndbm.h include file and an appropriate ndbm library exist. Consult the different i*ndbm\nvariables to find out the actual include location. Sometimes, a system has the header file\nbut not the library. This variable will only be set if the system has both.\n\n\"dndbmhusesprototypes\"\nFrom indbm.U:\n\nThis variable conditionally defines the \"NDBMHUSESPROTOTYPES\" symbol, which indicates\nthat the ndbm.h include file uses real \"ANSI\" C prototypes instead of K&R style function\ndeclarations. K&R style declarations are unsupported in C++, so the include file requires\nspecial handling when using a C++ compiler and this variable is undefined. Consult the\ndifferent d*ndbmhusesprototypes variables to get the same information for alternative\nndbm.h include files.\n\n\"dnearbyint\"\nFrom dnearbyint.U:\n\nThis variable conditionally defines \"HASNEARBYINT\" if nearbyint() is available to return\nthe integral value closest to (according to the current rounding mode) to x.\n\n\"dnewlocale\"\nFrom dnewlocale.U:\n\nThis variable conditionally defines the \"HASNEWLOCALE\" symbol, which indicates to the C\nprogram that the newlocale() routine is available to return a new locale object or modify an\nexisting locale object.\n\n\"dnextafter\"\nFrom dnextafter.U:\n\nThis variable conditionally defines \"HASNEXTAFTER\" if nextafter() is available to return\nthe next machine representable double from x in direction y.\n\n\"dnexttoward\"\nFrom dnexttoward.U:\n\nThis variable conditionally defines \"HASNEXTTOWARD\" if nexttoward() is available to return\nthe next machine representable long double from x in direction y.\n\n\"dnice\"\nFrom dnice.U:\n\nThis variable conditionally defines the \"HASNICE\" symbol, which indicates to the C program\nthat the nice() routine is available.\n\n\"dnllanginfo\"\nFrom dnllanginfo.U:\n\nThis variable conditionally defines the \"HASNLLANGINFO\" symbol, which indicates to the C\nprogram that the nllanginfo() routine is available.\n\n\"dnvpreservesuv\"\nFrom perlxv.U:\n\nThis variable indicates whether a variable of type nvtype can preserve all the bits a\nvariable of type uvtype.\n\n\"dnvzeroisallbitszero\"\nFrom perlxv.U:\n\nThis variable indicates whether a variable of type nvtype stores 0.0 in memory as all bits\nzero.\n\n\"doff64t\"\nFrom doff64t.U:\n\nThis symbol will be defined if the C compiler supports off64t.\n\n\"doldpthreadcreatejoinable\"\nFrom dpthrattrj.U:\n\nThis variable conditionally defines pthreadcreatejoinable. undef if pthread.h defines\n\"PTHREADCREATEJOINABLE\".\n\n\"doldpthreads\"\nFrom usethreads.U:\n\nThis variable conditionally defines the \"OLDPTHREADSAPI\" symbol, and indicates that Perl\nshould be built to use the old draft \"POSIX\" threads \"API\". This is only potentially\nmeaningful if usethreads is set.\n\n\"doldsock\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"OLDSOCKET\" symbol, which indicates that the \"BSD\"\nsocket interface is based on 4.1c and not 4.2.\n\n\"dopen3\"\nFrom dopen3.U:\n\nThis variable conditionally defines the HASOPEN3 manifest constant, which indicates to the\nC program that the 3 argument version of the open(2) function is available.\n\n\"dopenat\"\nFrom dfsat.U:\n\nThis variable conditionally defines the \"HASOPENAT\" symbol, which indicates the \"POSIX\"\nopenat() function is available.\n\n\"dpathconf\"\nFrom dpathconf.U:\n\nThis variable conditionally defines the \"HASPATHCONF\" symbol, which indicates to the C\nprogram that the pathconf() routine is available to determine file-system related limits and\noptions associated with a given filename.\n\n\"dpause\"\nFrom dpause.U:\n\nThis variable conditionally defines the \"HASPAUSE\" symbol, which indicates to the C program\nthat the pause() routine is available to suspend a process until a signal is received.\n\n\"dperlotherlibdirs\"\nFrom otherlibdirs.U:\n\nThis variable conditionally defines \"PERLOTHERLIBDIRS\", which contains a colon-separated\nset of paths for the perl binary to include in @\"INC\". See also otherlibdirs.\n\n\"dphostname\"\nFrom dgethname.U:\n\nThis variable conditionally defines the \"HASPHOSTNAME\" symbol, which contains the shell\ncommand which, when fed to popen(), may be used to derive the host name.\n\n\"dpipe\"\nFrom dpipe.U:\n\nThis variable conditionally defines the \"HASPIPE\" symbol, which indicates to the C program\nthat the pipe() routine is available to create an inter-process channel.\n\n\"dpipe2\"\nFrom dpipe2.U:\n\nThis variable conditionally defines the HASPIPE2 symbol, which indicates to the C program\nthat the pipe2() routine is available to create an inter-process channel.\n\n\"dpoll\"\nFrom dpoll.U:\n\nThis variable conditionally defines the \"HASPOLL\" symbol, which indicates to the C program\nthat the poll() routine is available to poll active file descriptors.\n\n\"dportable\"\nFrom dportable.U:\n\nThis variable conditionally defines the \"PORTABLE\" symbol, which indicates to the C program\nthat it should not assume that it is running on the machine it was compiled on.\n\n\"dprctl\"\nFrom dprctl.U:\n\nThis variable conditionally defines the \"HASPRCTL\" symbol, which indicates to the C program\nthat the prctl() routine is available. Note that there are at least two prctl variants:\nLinux and Irix. While they are somewhat similar, they are incompatible.\n\n\"dprctlsetname\"\nFrom dprctl.U:\n\nThis variable conditionally defines the \"HASPRCTLSETNAME\" symbol, which indicates to the\nC program that the prctl() routine supports the \"PRSETNAME\" option.\n\n\"dPRId64\"\nFrom quadfio.U:\n\nThis variable conditionally defines the PERLPRId64 symbol, which indicates that stdio has a\nsymbol to print 64-bit decimal numbers.\n\n\"dPRIeldbl\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the PERLPRIfldbl symbol, which indicates that stdio has\na symbol to print long doubles.\n\n\"dPRIEUldbl\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the PERLPRIfldbl symbol, which indicates that stdio has\na symbol to print long doubles. The \"U\" in the name is to separate this from dPRIeldbl so\nthat even case-blind systems can see the difference.\n\n\"dPRIfldbl\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the PERLPRIfldbl symbol, which indicates that stdio has\na symbol to print long doubles.\n\n\"dPRIFUldbl\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the PERLPRIfldbl symbol, which indicates that stdio has\na symbol to print long doubles. The \"U\" in the name is to separate this from dPRIfldbl so\nthat even case-blind systems can see the difference.\n\n\"dPRIgldbl\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the PERLPRIfldbl symbol, which indicates that stdio has\na symbol to print long doubles.\n\n\"dPRIGUldbl\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the PERLPRIfldbl symbol, which indicates that stdio has\na symbol to print long doubles. The \"U\" in the name is to separate this from dPRIgldbl so\nthat even case-blind systems can see the difference.\n\n\"dPRIi64\"\nFrom quadfio.U:\n\nThis variable conditionally defines the PERLPRIi64 symbol, which indicates that stdio has a\nsymbol to print 64-bit decimal numbers.\n\n\"dprintfformatnull\"\nFrom dattribut.U:\n\nThis variable conditionally defines \"PRINTFFORMATNULLOK\", which indicates the C compiler\nallows printf-like formats to be null.\n\n\"dPRIo64\"\nFrom quadfio.U:\n\nThis variable conditionally defines the PERLPRIo64 symbol, which indicates that stdio has a\nsymbol to print 64-bit octal numbers.\n\n\"dPRIu64\"\nFrom quadfio.U:\n\nThis variable conditionally defines the PERLPRIu64 symbol, which indicates that stdio has a\nsymbol to print 64-bit unsigned decimal numbers.\n\n\"dPRIx64\"\nFrom quadfio.U:\n\nThis variable conditionally defines the PERLPRIx64 symbol, which indicates that stdio has a\nsymbol to print 64-bit hexadecimal numbers.\n\n\"dPRIXU64\"\nFrom quadfio.U:\n\nThis variable conditionally defines the PERLPRIXU64 symbol, which indicates that stdio has\na symbol to print 64-bit hExADECimAl numbers. The \"U\" in the name is to separate this from\ndPRIx64 so that even case-blind systems can see the difference.\n\n\"dprocselfexe\"\nFrom dprocselfexe.U:\n\nDefined if $procselfexe is symlink to the absolute pathname of the executing program.\n\n\"dpseudofork\"\nFrom dvfork.U:\n\nThis variable conditionally defines the \"HASPSEUDOFORK\" symbol, which indicates that an\nemulation of the fork routine is available.\n\n\"dpthreadatfork\"\nFrom dpthreadatfork.U:\n\nThis variable conditionally defines the \"HASPTHREADATFORK\" symbol, which indicates to the\nC program that the pthreadatfork() routine is available.\n\n\"dpthreadattrsetscope\"\nFrom dpthreadattrss.U:\n\nThis variable conditionally defines \"HASPTHREADATTRSETSCOPE\" if pthreadattrsetscope()\nis available to set the contention scope attribute of a thread attribute object.\n\n\"dpthreadyield\"\nFrom dpthready.U:\n\nThis variable conditionally defines the \"HASPTHREADYIELD\" symbol if the pthreadyield\nroutine is available to yield the execution of the current thread.\n\n\"dptrdifft\"\nFrom dptrdifft.U:\n\nThis symbol will be defined if the C compiler supports ptrdifft.\n\n\"dpwage\"\nFrom ipwd.U:\n\nThis variable conditionally defines \"PWAGE\", which indicates that struct passwd contains\npwage.\n\n\"dpwchange\"\nFrom ipwd.U:\n\nThis variable conditionally defines \"PWCHANGE\", which indicates that struct passwd contains\npwchange.\n\n\"dpwclass\"\nFrom ipwd.U:\n\nThis variable conditionally defines \"PWCLASS\", which indicates that struct passwd contains\npwclass.\n\n\"dpwcomment\"\nFrom ipwd.U:\n\nThis variable conditionally defines \"PWCOMMENT\", which indicates that struct passwd contains\npwcomment.\n\n\"dpwexpire\"\nFrom ipwd.U:\n\nThis variable conditionally defines \"PWEXPIRE\", which indicates that struct passwd contains\npwexpire.\n\n\"dpwgecos\"\nFrom ipwd.U:\n\nThis variable conditionally defines \"PWGECOS\", which indicates that struct passwd contains\npwgecos.\n\n\"dpwpasswd\"\nFrom ipwd.U:\n\nThis variable conditionally defines \"PWPASSWD\", which indicates that struct passwd contains\npwpasswd.\n\n\"dpwquota\"\nFrom ipwd.U:\n\nThis variable conditionally defines \"PWQUOTA\", which indicates that struct passwd contains\npwquota.\n\n\"dqgcvt\"\nFrom dqgcvt.U:\n\nThis variable conditionally defines the \"HASQGCVT\" symbol, which indicates to the C program\nthat the qgcvt() routine is available.\n\n\"dquad\"\nFrom quadtype.U:\n\nThis variable, if defined, tells that there's a 64-bit integer type, quadtype.\n\n\"dquerylocale\"\nFrom dnewlocale.U:\n\nThis variable conditionally defines the \"HASQUERYLOCALE\" symbol, which indicates to the C\nprogram that the querylocale() routine is available to return the name of the locale for a\ncategory mask.\n\n\"drandomr\"\nFrom drandomr.U:\n\nThis variable conditionally defines the \"HASRANDOMR\" symbol, which indicates to the C\nprogram that the randomr() routine is available.\n\n\"drecomp\"\nFrom dregcmp.U:\n\nThis variable conditionally defines the \"HASRECOMP\" symbol, which indicates to the C\nprogram that the recomp() routine is available for regular pattern matching (usually on\n\"BSD\"). If so, it is likely that reexec() exists.\n\n\"dreaddir\"\nFrom dreaddir.U:\n\nThis variable conditionally defines \"HASREADDIR\" if readdir() is available to read\ndirectory entries.\n\n\"dreaddir64r\"\nFrom dreaddir64r.U:\n\nThis variable conditionally defines the HASREADDIR64R symbol, which indicates to the C\nprogram that the readdir64r() routine is available.\n\n\"dreaddirr\"\nFrom dreaddirr.U:\n\nThis variable conditionally defines the \"HASREADDIRR\" symbol, which indicates to the C\nprogram that the readdirr() routine is available.\n\n\"dreadlink\"\nFrom dreadlink.U:\n\nThis variable conditionally defines the \"HASREADLINK\" symbol, which indicates to the C\nprogram that the readlink() routine is available to read the value of a symbolic link.\n\n\"dreadv\"\nFrom dreadv.U:\n\nThis variable conditionally defines the \"HASREADV\" symbol, which indicates to the C program\nthat the readv() routine is available.\n\n\"drecvmsg\"\nFrom drecvmsg.U:\n\nThis variable conditionally defines the \"HASRECVMSG\" symbol, which indicates to the C\nprogram that the recvmsg() routine is available.\n\n\"dregcmp\"\nFrom dregcmp.U:\n\nThis variable conditionally defines the \"HASREGCMP\" symbol, which indicates to the C\nprogram that the regcmp() routine is available for regular pattern matching (usually on\nSystem V).\n\n\"dregcomp\"\nFrom dregcmp.U:\n\nThis variable conditionally defines the \"HASREGCOMP\" symbol, which indicates to the C\nprogram that the regcomp() routine is available for regular pattern matching (usually on\nPOSIX.2 conforming systems).\n\n\"dremainder\"\nFrom dremainder.U:\n\nThis variable conditionally defines the \"HASREMAINDER\" symbol, which indicates to the C\nprogram that the remainder() routine is available.\n\n\"dremquo\"\nFrom dremquo.U:\n\nThis variable conditionally defines the \"HASREMQUO\" symbol, which indicates to the C\nprogram that the remquo() routine is available.\n\n\"drename\"\nFrom drename.U:\n\nThis variable conditionally defines the \"HASRENAME\" symbol, which indicates to the C\nprogram that the rename() routine is available to rename files.\n\n\"drenameat\"\nFrom dfsat.U:\n\nThis variable conditionally defines the \"HASRENAMEAT\" symbol, which indicates the \"POSIX\"\nrenameat() function is available.\n\n\"drewinddir\"\nFrom dreaddir.U:\n\nThis variable conditionally defines \"HASREWINDDIR\" if rewinddir() is available.\n\n\"drint\"\nFrom drint.U:\n\nThis variable conditionally defines the \"HASRINT\" symbol, which indicates to the C program\nthat the rint() routine is available.\n\n\"drmdir\"\nFrom drmdir.U:\n\nThis variable conditionally defines \"HASRMDIR\" if rmdir() is available to remove\ndirectories.\n\n\"dround\"\nFrom dround.U:\n\nThis variable conditionally defines the \"HASROUND\" symbol, which indicates to the C program\nthat the round() routine is available.\n\n\"dsbrkproto\"\nFrom dsbrkproto.U:\n\nThis variable conditionally defines the \"HASSBRKPROTO\" symbol, which indicates to the C\nprogram that the system provides a prototype for the sbrk() function. Otherwise, it is up to\nthe program to supply one.\n\n\"dscalbn\"\nFrom dscalbn.U:\n\nThis variable conditionally defines the \"HASSCALBN\" symbol, which indicates to the C\nprogram that the scalbn() routine is available.\n\n\"dscalbnl\"\nFrom dscalbnl.U:\n\nThis variable conditionally defines the \"HASSCALBNL\" symbol, which indicates to the C\nprogram that the scalbnl() routine is available. If ilogbl is also present we can emulate\nfrexpl.\n\n\"dschedyield\"\nFrom dpthready.U:\n\nThis variable conditionally defines the \"HASSCHEDYIELD\" symbol if the schedyield routine\nis available to yield the execution of the current thread.\n\n\"dscmrights\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASSCMRIGHTS\" symbol, which indicates that the\n\"SCMRIGHTS\" is available. #ifdef is not enough because it may be an enum, glibc has been\nknown to do this.\n\n\"dSCNfldbl\"\nFrom longdblfio.U:\n\nThis variable conditionally defines the PERLPRIfldbl symbol, which indicates that stdio has\na symbol to scan long doubles.\n\n\"dseekdir\"\nFrom dreaddir.U:\n\nThis variable conditionally defines \"HASSEEKDIR\" if seekdir() is available.\n\n\"dselect\"\nFrom dselect.U:\n\nThis variable conditionally defines \"HASSELECT\" if select() is available to select active\nfile descriptors. A inclusion may be necessary for the timeout field.\n\n\"dsem\"\nFrom dsem.U:\n\nThis variable conditionally defines the \"HASSEM\" symbol, which indicates that the entire\nsem*(2) library is present.\n\n\"dsemctl\"\nFrom dsemctl.U:\n\nThis variable conditionally defines the \"HASSEMCTL\" symbol, which indicates to the C\nprogram that the semctl() routine is available.\n\n\"dsemctlsemidds\"\nFrom dunionsemun.U:\n\nThis variable conditionally defines \"USESEMCTLSEMIDDS\", which indicates that struct\nsemidds * is to be used for semctl \"IPCSTAT\".\n\n\"dsemctlsemun\"\nFrom dunionsemun.U:\n\nThis variable conditionally defines \"USESEMCTLSEMUN\", which indicates that union semun is\nto be used for semctl \"IPCSTAT\".\n\n\"dsemget\"\nFrom dsemget.U:\n\nThis variable conditionally defines the \"HASSEMGET\" symbol, which indicates to the C\nprogram that the semget() routine is available.\n\n\"dsemop\"\nFrom dsemop.U:\n\nThis variable conditionally defines the \"HASSEMOP\" symbol, which indicates to the C program\nthat the semop() routine is available.\n\n\"dsendmsg\"\nFrom dsendmsg.U:\n\nThis variable conditionally defines the \"HASSENDMSG\" symbol, which indicates to the C\nprogram that the sendmsg() routine is available.\n\n\"dsetegid\"\nFrom dsetegid.U:\n\nThis variable conditionally defines the \"HASSETEGID\" symbol, which indicates to the C\nprogram that the setegid() routine is available to change the effective gid of the current\nprogram.\n\n\"dseteuid\"\nFrom dseteuid.U:\n\nThis variable conditionally defines the \"HASSETEUID\" symbol, which indicates to the C\nprogram that the seteuid() routine is available to change the effective uid of the current\nprogram.\n\n\"dsetgrent\"\nFrom dsetgrent.U:\n\nThis variable conditionally defines the \"HASSETGRENT\" symbol, which indicates to the C\nprogram that the setgrent() routine is available for initializing sequential access to the\ngroup database.\n\n\"dsetgrentr\"\nFrom dsetgrentr.U:\n\nThis variable conditionally defines the \"HASSETGRENTR\" symbol, which indicates to the C\nprogram that the setgrentr() routine is available.\n\n\"dsetgrps\"\nFrom dsetgrps.U:\n\nThis variable conditionally defines the \"HASSETGROUPS\" symbol, which indicates to the C\nprogram that the setgroups() routine is available to set the list of process groups.\n\n\"dsethent\"\nFrom dsethent.U:\n\nThis variable conditionally defines \"HASSETHOSTENT\" if sethostent() is available.\n\n\"dsethostentr\"\nFrom dsethostentr.U:\n\nThis variable conditionally defines the \"HASSETHOSTENTR\" symbol, which indicates to the C\nprogram that the sethostentr() routine is available.\n\n\"dsetitimer\"\nFrom dsetitimer.U:\n\nThis variable conditionally defines the \"HASSETITIMER\" symbol, which indicates to the C\nprogram that the setitimer() routine is available.\n\n\"dsetlinebuf\"\nFrom dsetlnbuf.U:\n\nThis variable conditionally defines the \"HASSETLINEBUF\" symbol, which indicates to the C\nprogram that the setlinebuf() routine is available to change stderr or stdout from\nblock-buffered or unbuffered to a line-buffered mode.\n\n\"dsetlocale\"\nFrom dsetlocale.U:\n\nThis variable conditionally defines \"HASSETLOCALE\" if setlocale() is available to handle\nlocale-specific ctype implementations.\n\n\"dsetlocaleacceptsanylocalename\"\nFrom dsetlocale.U:\n\nThis variable conditionally defines \"SETLOCALEACCEPTSANYLOCALENAME\" if setlocale()\naccepts any locale name.\n\n\"dsetlocaler\"\nFrom dsetlocaler.U:\n\nThis variable conditionally defines the \"HASSETLOCALER\" symbol, which indicates to the C\nprogram that the setlocaler() routine is available.\n\n\"dsetnent\"\nFrom dsetnent.U:\n\nThis variable conditionally defines \"HASSETNETENT\" if setnetent() is available.\n\n\"dsetnetentr\"\nFrom dsetnetentr.U:\n\nThis variable conditionally defines the \"HASSETNETENTR\" symbol, which indicates to the C\nprogram that the setnetentr() routine is available.\n\n\"dsetpent\"\nFrom dsetpent.U:\n\nThis variable conditionally defines \"HASSETPROTOENT\" if setprotoent() is available.\n\n\"dsetpgid\"\nFrom dsetpgid.U:\n\nThis variable conditionally defines the \"HASSETPGID\" symbol if the setpgid(pid, gpid)\nfunction is available to set process group \"ID\".\n\n\"dsetpgrp\"\nFrom dsetpgrp.U:\n\nThis variable conditionally defines \"HASSETPGRP\" if setpgrp() is available to set the\ncurrent process group.\n\n\"dsetpgrp2\"\nFrom dsetpgrp2.U:\n\nThis variable conditionally defines the HASSETPGRP2 symbol, which indicates to the C\nprogram that the setpgrp2() (as in DG/\"UX\") routine is available to set the current process\ngroup.\n\n\"dsetprior\"\nFrom dsetprior.U:\n\nThis variable conditionally defines \"HASSETPRIORITY\" if setpriority() is available to set a\nprocess's priority.\n\n\"dsetproctitle\"\nFrom dsetproctitle.U:\n\nThis variable conditionally defines the \"HASSETPROCTITLE\" symbol, which indicates to the C\nprogram that the setproctitle() routine is available.\n\n\"dsetprotoentr\"\nFrom dsetprotoentr.U:\n\nThis variable conditionally defines the \"HASSETPROTOENTR\" symbol, which indicates to the C\nprogram that the setprotoentr() routine is available.\n\n\"dsetpwent\"\nFrom dsetpwent.U:\n\nThis variable conditionally defines the \"HASSETPWENT\" symbol, which indicates to the C\nprogram that the setpwent() routine is available for initializing sequential access to the\npasswd database.\n\n\"dsetpwentr\"\nFrom dsetpwentr.U:\n\nThis variable conditionally defines the \"HASSETPWENTR\" symbol, which indicates to the C\nprogram that the setpwentr() routine is available.\n\n\"dsetregid\"\nFrom dsetregid.U:\n\nThis variable conditionally defines \"HASSETREGID\" if setregid() is available to change the\nreal and effective gid of the current process.\n\n\"dsetresgid\"\nFrom dsetregid.U:\n\nThis variable conditionally defines \"HASSETRESGID\" if setresgid() is available to change\nthe real, effective and saved gid of the current process.\n\n\"dsetresuid\"\nFrom dsetreuid.U:\n\nThis variable conditionally defines \"HASSETREUID\" if setresuid() is available to change the\nreal, effective and saved uid of the current process.\n\n\"dsetreuid\"\nFrom dsetreuid.U:\n\nThis variable conditionally defines \"HASSETREUID\" if setreuid() is available to change the\nreal and effective uid of the current process.\n\n\"dsetrgid\"\nFrom dsetrgid.U:\n\nThis variable conditionally defines the \"HASSETRGID\" symbol, which indicates to the C\nprogram that the setrgid() routine is available to change the real gid of the current\nprogram.\n\n\"dsetruid\"\nFrom dsetruid.U:\n\nThis variable conditionally defines the \"HASSETRUID\" symbol, which indicates to the C\nprogram that the setruid() routine is available to change the real uid of the current\nprogram.\n\n\"dsetsent\"\nFrom dsetsent.U:\n\nThis variable conditionally defines \"HASSETSERVENT\" if setservent() is available.\n\n\"dsetserventr\"\nFrom dsetserventr.U:\n\nThis variable conditionally defines the \"HASSETSERVENTR\" symbol, which indicates to the C\nprogram that the setserventr() routine is available.\n\n\"dsetsid\"\nFrom dsetsid.U:\n\nThis variable conditionally defines \"HASSETSID\" if setsid() is available to set the process\ngroup \"ID\".\n\n\"dsetvbuf\"\nFrom dsetvbuf.U:\n\nThis variable conditionally defines the \"HASSETVBUF\" symbol, which indicates to the C\nprogram that the setvbuf() routine is available to change buffering on an open stdio stream.\n\n\"dshm\"\nFrom dshm.U:\n\nThis variable conditionally defines the \"HASSHM\" symbol, which indicates that the entire\nshm*(2) library is present.\n\n\"dshmat\"\nFrom dshmat.U:\n\nThis variable conditionally defines the \"HASSHMAT\" symbol, which indicates to the C program\nthat the shmat() routine is available.\n\n\"dshmatprototype\"\nFrom dshmat.U:\n\nThis variable conditionally defines the \"HASSHMATPROTOTYPE\" symbol, which indicates that\nsys/shm.h has a prototype for shmat.\n\n\"dshmctl\"\nFrom dshmctl.U:\n\nThis variable conditionally defines the \"HASSHMCTL\" symbol, which indicates to the C\nprogram that the shmctl() routine is available.\n\n\"dshmdt\"\nFrom dshmdt.U:\n\nThis variable conditionally defines the \"HASSHMDT\" symbol, which indicates to the C program\nthat the shmdt() routine is available.\n\n\"dshmget\"\nFrom dshmget.U:\n\nThis variable conditionally defines the \"HASSHMGET\" symbol, which indicates to the C\nprogram that the shmget() routine is available.\n\n\"dsigaction\"\nFrom dsigaction.U:\n\nThis variable conditionally defines the \"HASSIGACTION\" symbol, which indicates that the Vr4\nsigaction() routine is available.\n\n\"dsiginfosiaddr\"\nFrom dsiginfosi.U:\n\nThis variable conditionally defines the \"HASSIGINFOSIADDR\" symbol, which indicates that\nthe siginfot struct has the siaddr member.\n\n\"dsiginfosiband\"\nFrom dsiginfosi.U:\n\nThis variable conditionally defines the \"HASSIGINFOSIBAND\" symbol, which indicates that\nthe siginfot struct has the siband member.\n\n\"dsiginfosierrno\"\nFrom dsiginfosi.U:\n\nThis variable conditionally defines the \"HASSIGINFOSIERRNO\" symbol, which indicates that\nthe siginfot struct has the sierrno member.\n\n\"dsiginfosifd\"\nFrom dsiginfosi.U:\n\nThis variable conditionally defines the \"HASSIGINFOSIFD\" symbol, which indicates that the\nsiginfot struct has the sifd member.\n\n\"dsiginfosipid\"\nFrom dsiginfosi.U:\n\nThis variable conditionally defines the \"HASSIGINFOSIPID\" symbol, which indicates that\nthe siginfot struct has the sipid member.\n\n\"dsiginfosistatus\"\nFrom dsiginfosi.U:\n\nThis variable conditionally defines the \"HASSIGINFOSISTATUS\" symbol, which indicates that\nthe siginfot struct has the sistatus member.\n\n\"dsiginfosiuid\"\nFrom dsiginfosi.U:\n\nThis variable conditionally defines the \"HASSIGINFOSIUID\" symbol, which indicates that\nthe siginfot struct has the siuid member.\n\n\"dsiginfosivalue\"\nFrom dsiginfosi.U:\n\nThis variable conditionally defines the \"HASSIGINFOSIVALUE\" symbol, which indicates that\nthe siginfot struct has the sivalue member.\n\n\"dsignbit\"\nFrom dsignbit.U:\n\nThis variable conditionally defines the \"HASSIGNBIT\" symbol, which indicates to the C\nprogram that the signbit() routine is available and safe to use with perl's intern \"NV\"\ntype.\n\n\"dsigprocmask\"\nFrom dsigprocmask.U:\n\nThis variable conditionally defines \"HASSIGPROCMASK\" if sigprocmask() is available to\nexamine or change the signal mask of the calling process.\n\n\"dsigsetjmp\"\nFrom dsigsetjmp.U:\n\nThis variable conditionally defines the \"HASSIGSETJMP\" symbol, which indicates that the\nsigsetjmp() routine is available to call setjmp() and optionally save the process's signal\nmask.\n\n\"dsin6scopeid\"\nFrom dsocket.U:\n\nThis variable conditionally defines the HASSIN6SCOPEID symbol, which indicates that a\nstruct sockaddrin6 structure has the sin6scopeid member.\n\n\"dsitearch\"\nFrom sitearch.U:\n\nThis variable conditionally defines \"SITEARCH\" to hold the pathname of\narchitecture-dependent library files for $package. If $sitearch is the same as $archlib,\nthen this is set to undef.\n\n\"dsnprintf\"\nFrom dsnprintf.U:\n\nThis variable conditionally defines the \"HASSNPRINTF\" symbol, which indicates to the C\nprogram that the snprintf () library function is available.\n\n\"dsockaddrin6\"\nFrom dsocket.U:\n\nThis variable conditionally defines the HASSOCKADDRIN6 symbol, which indicates the\navailability of a struct sockaddrin6.\n\n\"dsockaddrsalen\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASSOCKADDRSALEN\" symbol, which indicates that a\nstruct sockaddr structure has the salen member.\n\n\"dsockaddrstorage\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASSOCKADDRSTORAGE\" symbol, which indicates the\navailability of a struct sockaddrstorage.\n\n\"dsockatmark\"\nFrom dsockatmark.U:\n\nThis variable conditionally defines the \"HASSOCKATMARK\" symbol, which indicates to the C\nprogram that the sockatmark() routine is available.\n\n\"dsockatmarkproto\"\nFrom dsockatmarkproto.U:\n\nThis variable conditionally defines the \"HASSOCKATMARKPROTO\" symbol, which indicates to\nthe C program that the system provides a prototype for the sockatmark() function. Otherwise,\nit is up to the program to supply one.\n\n\"dsocket\"\nFrom dsocket.U:\n\nThis variable conditionally defines \"HASSOCKET\", which indicates that the \"BSD\" socket\ninterface is supported.\n\n\"dsocklent\"\nFrom dsocklent.U:\n\nThis symbol will be defined if the C compiler supports socklent.\n\n\"dsockpair\"\nFrom dsocket.U:\n\nThis variable conditionally defines the \"HASSOCKETPAIR\" symbol, which indicates that the\n\"BSD\" socketpair() is supported.\n\n\"dsocks5init\"\nFrom dsocks5init.U:\n\nThis variable conditionally defines the HASSOCKS5INIT symbol, which indicates to the C\nprogram that the socks5init() routine is available.\n\n\"dsqrtl\"\nFrom dsqrtl.U:\n\nThis variable conditionally defines the \"HASSQRTL\" symbol, which indicates to the C program\nthat the sqrtl() routine is available.\n\n\"dsrand48r\"\nFrom dsrand48r.U:\n\nThis variable conditionally defines the HASSRAND48R symbol, which indicates to the C\nprogram that the srand48r() routine is available.\n\n\"dsrandomr\"\nFrom dsrandomr.U:\n\nThis variable conditionally defines the \"HASSRANDOMR\" symbol, which indicates to the C\nprogram that the srandomr() routine is available.\n\n\"dsresgproto\"\nFrom dsresgproto.U:\n\nThis variable conditionally defines the \"HASSETRESGIDPROTO\" symbol, which indicates to the\nC program that the system provides a prototype for the setresgid() function. Otherwise, it\nis up to the program to supply one.\n\n\"dsresuproto\"\nFrom dsresuproto.U:\n\nThis variable conditionally defines the \"HASSETRESUIDPROTO\" symbol, which indicates to the\nC program that the system provides a prototype for the setresuid() function. Otherwise, it\nis up to the program to supply one.\n\n\"dstat\"\nFrom dstat.U:\n\nThis variable conditionally defines \"HASSTAT\" if stat() is available to get file status.\n\n\"dstatblks\"\nFrom dstatblks.U:\n\nThis variable conditionally defines \"USESTATBLOCKS\" if this system has a stat structure\ndeclaring stblksize and stblocks.\n\n\"dstatfsfflags\"\nFrom dstatfsfflags.U:\n\nThis variable conditionally defines the \"HASSTRUCTSTATFSFFLAGS\" symbol, which indicates\nto struct statfs from has fflags member. This kind of struct statfs is coming from\nsys/mount.h (\"BSD\"), not from sys/statfs.h (\"SYSV\").\n\n\"dstatfss\"\nFrom dstatfss.U:\n\nThis variable conditionally defines the \"HASSTRUCTSTATFS\" symbol, which indicates that the\nstruct statfs is supported.\n\n\"dstaticinline\"\nFrom dstaticinline.U:\n\nThis variable conditionally defines the \"HASSTATICINLINE\" symbol, which indicates that the\nC compiler supports C99-style static inline. That is, the function can't be called from\nanother translation unit.\n\n\"dstatvfs\"\nFrom dstatvfs.U:\n\nThis variable conditionally defines the \"HASSTATVFS\" symbol, which indicates to the C\nprogram that the statvfs() routine is available.\n\n\"dstdiocntlval\"\nFrom dstdstdio.U:\n\nThis variable conditionally defines \"STDIOCNTLVALUE\" if the \"FILEcnt\" macro can be used\nas an lvalue.\n\n\"dstdioptrlval\"\nFrom dstdstdio.U:\n\nThis variable conditionally defines \"STDIOPTRLVALUE\" if the \"FILEptr\" macro can be used\nas an lvalue.\n\n\"dstdioptrlvalnochangecnt\"\nFrom dstdstdio.U:\n\nThis symbol is defined if using the \"FILEptr\" macro as an lvalue to increase the pointer by\nn leaves Filecnt(fp) unchanged.\n\n\"dstdioptrlvalsetscnt\"\nFrom dstdstdio.U:\n\nThis symbol is defined if using the \"FILEptr\" macro as an lvalue to increase the pointer by\nn has the side effect of decreasing the value of Filecnt(fp) by n.\n\n\"dstdiostreamarray\"\nFrom stdiostreams.U:\n\nThis variable tells whether there is an array holding the stdio streams.\n\n\"dstdiobase\"\nFrom dstdstdio.U:\n\nThis variable conditionally defines \"USESTDIOBASE\" if this system has a \"FILE\" structure\ndeclaring a usable base field (or equivalent) in stdio.h.\n\n\"dstdstdio\"\nFrom dstdstdio.U:\n\nThis variable conditionally defines \"USESTDIOPTR\" if this system has a \"FILE\" structure\ndeclaring usable ptr and cnt fields (or equivalent) in stdio.h.\n\n\"dstrcoll\"\nFrom dstrcoll.U:\n\nThis variable conditionally defines \"HASSTRCOLL\" if strcoll() is available to compare\nstrings using collating information.\n\n\"dstrerrorl\"\nFrom dstrerrorl.U:\n\nThis variable conditionally defines the \"HASSTRERRORL\" symbol, which indicates to the C\nprogram that the strerrorl() routine is available to return the error message for a given\nerrno value in a particular locale (identified by a localet object).\n\n\"dstrerrorr\"\nFrom dstrerrorr.U:\n\nThis variable conditionally defines the \"HASSTRERRORR\" symbol, which indicates to the C\nprogram that the strerrorr() routine is available.\n\n\"dstrftime\"\nFrom dstrftime.U:\n\nThis variable conditionally defines the \"HASSTRFTIME\" symbol, which indicates to the C\nprogram that the strftime() routine is available.\n\n\"dstrlcat\"\nFrom dstrlcat.U:\n\nThis variable conditionally defines the \"HASSTRLCAT\" symbol, which indicates to the C\nprogram that the strlcat () routine is available.\n\n\"dstrlcpy\"\nFrom dstrlcpy.U:\n\nThis variable conditionally defines the \"HASSTRLCPY\" symbol, which indicates to the C\nprogram that the strlcpy () routine is available.\n\n\"dstrnlen\"\nFrom dstrnlen.U:\n\nThis variable conditionally defines the \"HASSTRNLEN\" symbol, which indicates to the C\nprogram that the strnlen () routine is available.\n\n\"dstrtod\"\nFrom dstrtod.U:\n\nThis variable conditionally defines the \"HASSTRTOD\" symbol, which indicates to the C\nprogram that the strtod() routine is available to provide better numeric string conversion\nthan atof().\n\n\"dstrtodl\"\nFrom dstrtodl.U:\n\nThis variable conditionally defines the \"HASSTRTODL\" symbol, which indicates to the C\nprogram that the strtodl() routine is available.\n\n\"dstrtol\"\nFrom dstrtol.U:\n\nThis variable conditionally defines the \"HASSTRTOL\" symbol, which indicates to the C\nprogram that the strtol() routine is available to provide better numeric string conversion\nthan atoi() and friends.\n\n\"dstrtold\"\nFrom dstrtold.U:\n\nThis variable conditionally defines the \"HASSTRTOLD\" symbol, which indicates to the C\nprogram that the strtold() routine is available.\n\n\"dstrtoldl\"\nFrom dstrtoldl.U:\n\nThis variable conditionally defines the \"HASSTRTOLDL\" symbol, which indicates to the C\nprogram that the strtoldl() routine is available.\n\n\"dstrtoll\"\nFrom dstrtoll.U:\n\nThis variable conditionally defines the \"HASSTRTOLL\" symbol, which indicates to the C\nprogram that the strtoll() routine is available.\n\n\"dstrtoq\"\nFrom dstrtoq.U:\n\nThis variable conditionally defines the \"HASSTRTOQ\" symbol, which indicates to the C\nprogram that the strtoq() routine is available.\n\n\"dstrtoul\"\nFrom dstrtoul.U:\n\nThis variable conditionally defines the \"HASSTRTOUL\" symbol, which indicates to the C\nprogram that the strtoul() routine is available to provide conversion of strings to unsigned\nlong.\n\n\"dstrtoull\"\nFrom dstrtoull.U:\n\nThis variable conditionally defines the \"HASSTRTOULL\" symbol, which indicates to the C\nprogram that the strtoull() routine is available.\n\n\"dstrtouq\"\nFrom dstrtouq.U:\n\nThis variable conditionally defines the \"HASSTRTOUQ\" symbol, which indicates to the C\nprogram that the strtouq() routine is available.\n\n\"dstrxfrm\"\nFrom dstrxfrm.U:\n\nThis variable conditionally defines \"HASSTRXFRM\" if strxfrm() is available to transform\nstrings.\n\n\"dsuidsafe\"\nFrom ddosuid.U:\n\nThis variable conditionally defines \"SETUIDSCRIPTSARESECURENOW\" if setuid scripts can be\nsecure. This test looks in /dev/fd/.\n\n\"dsymlink\"\nFrom dsymlink.U:\n\nThis variable conditionally defines the \"HASSYMLINK\" symbol, which indicates to the C\nprogram that the symlink() routine is available to create symbolic links.\n\n\"dsyscall\"\nFrom dsyscall.U:\n\nThis variable conditionally defines \"HASSYSCALL\" if syscall() is available call arbitrary\nsystem calls.\n\n\"dsyscallproto\"\nFrom dsyscallproto.U:\n\nThis variable conditionally defines the \"HASSYSCALLPROTO\" symbol, which indicates to the C\nprogram that the system provides a prototype for the syscall() function. Otherwise, it is up\nto the program to supply one.\n\n\"dsysconf\"\nFrom dsysconf.U:\n\nThis variable conditionally defines the \"HASSYSCONF\" symbol, which indicates to the C\nprogram that the sysconf() routine is available to determine system related limits and\noptions.\n\n\"dsysernlst\"\nFrom dstrerror.U:\n\nThis variable conditionally defines \"HASSYSERRNOLIST\" if syserrnolist[] is available to\ntranslate error numbers to the symbolic name.\n\n\"dsyserrlst\"\nFrom dstrerror.U:\n\nThis variable conditionally defines \"HASSYSERRLIST\" if syserrlist[] is available to\ntranslate error numbers to strings.\n\n\"dsystem\"\nFrom dsystem.U:\n\nThis variable conditionally defines \"HASSYSTEM\" if system() is available to issue a shell\ncommand.\n\n\"dtcgetpgrp\"\nFrom dtcgtpgrp.U:\n\nThis variable conditionally defines the \"HASTCGETPGRP\" symbol, which indicates to the C\nprogram that the tcgetpgrp() routine is available. to get foreground process group \"ID\".\n\n\"dtcsetpgrp\"\nFrom dtcstpgrp.U:\n\nThis variable conditionally defines the \"HASTCSETPGRP\" symbol, which indicates to the C\nprogram that the tcsetpgrp() routine is available to set foreground process group \"ID\".\n\n\"dtelldir\"\nFrom dreaddir.U:\n\nThis variable conditionally defines \"HASTELLDIR\" if telldir() is available.\n\n\"dtelldirproto\"\nFrom dtelldirproto.U:\n\nThis variable conditionally defines the \"HASTELLDIRPROTO\" symbol, which indicates to the C\nprogram that the system provides a prototype for the telldir() function. Otherwise, it is up\nto the program to supply one.\n\n\"dtgamma\"\nFrom dtgamma.U:\n\nThis variable conditionally defines the \"HASTGAMMA\" symbol, which indicates to the C\nprogram that the tgamma() routine is available for the gamma function. See also dlgamma.\n\n\"dthreadsafenllanginfol\"\nFrom dnllanginfol.U:\n\nThis variable contains the eventual value of the \"HASTHREADSAFENLLANGINFOL\" symbol,\nwhich indicates if the nllanginfol() function exists and is thread-safe.\n\n\"dtime\"\nFrom dtime.U:\n\nThis variable conditionally defines the \"HASTIME\" symbol, which indicates that the time()\nroutine exists. The time() routine is normally provided on \"UNIX\" systems.\n\n\"dtimegm\"\nFrom dtimegm.U:\n\nThis variable conditionally defines the \"HASTIMEGM\" symbol, which indicates to the C\nprogram that the timegm () routine is available.\n\n\"dtimes\"\nFrom dtimes.U:\n\nThis variable conditionally defines the \"HASTIMES\" symbol, which indicates that the times()\nroutine exists. The times() routine is normally provided on \"UNIX\" systems. You may have to\ninclude .\n\n\"dtmtmgmtoff\"\nFrom itime.U:\n\nThis variable conditionally defines \"HASTMTMGMTOFF\", which indicates to the C program\nthat the struct tm has the tmgmtoff field.\n\n\"dtmtmzone\"\nFrom itime.U:\n\nThis variable conditionally defines \"HASTMTMZONE\", which indicates to the C program that\nthe struct tm has the tmzone field.\n\n\"dtmpnamr\"\nFrom dtmpnamr.U:\n\nThis variable conditionally defines the \"HASTMPNAMR\" symbol, which indicates to the C\nprogram that the tmpnamr() routine is available.\n\n\"dtowlower\"\nFrom dtowlower.U:\n\nThis variable conditionally defines the \"HASTOWLOWER\" symbol, which indicates to the C\nprogram that the towlower() routine is available.\n\n\"dtowupper\"\nFrom dtowupper.U:\n\nThis variable conditionally defines the \"HASTOWUPPER\" symbol, which indicates to the C\nprogram that the towupper() routine is available.\n\n\"dtrunc\"\nFrom dtrunc.U:\n\nThis variable conditionally defines the \"HASTRUNC\" symbol, which indicates to the C program\nthat the trunc() routine is available to round doubles towards zero.\n\n\"dtruncate\"\nFrom dtruncate.U:\n\nThis variable conditionally defines \"HASTRUNCATE\" if truncate() is available to truncate\nfiles.\n\n\"dtruncl\"\nFrom dtruncl.U:\n\nThis variable conditionally defines the \"HASTRUNCL\" symbol, which indicates to the C\nprogram that the truncl() routine is available to round long doubles towards zero. If\ncopysignl is also present, we can emulate modfl.\n\n\"dttynamer\"\nFrom dttynamer.U:\n\nThis variable conditionally defines the \"HASTTYNAMER\" symbol, which indicates to the C\nprogram that the ttynamer() routine is available.\n\n\"dtzname\"\nFrom dtzname.U:\n\nThis variable conditionally defines \"HASTZNAME\" if tzname[] is available to access timezone\nnames.\n\n\"du32align\"\nFrom du32align.U:\n\nThis variable tells whether you must access character data through U32-aligned pointers.\n\n\"dualarm\"\nFrom dualarm.U:\n\nThis variable conditionally defines the \"HASUALARM\" symbol, which indicates to the C\nprogram that the ualarm() routine is available.\n\n\"dumask\"\nFrom dumask.U:\n\nThis variable conditionally defines the \"HASUMASK\" symbol, which indicates to the C program\nthat the umask() routine is available. to set and get the value of the file creation mask.\n\n\"duname\"\nFrom dgethname.U:\n\nThis variable conditionally defines the \"HASUNAME\" symbol, which indicates to the C program\nthat the uname() routine may be used to derive the host name.\n\n\"dunionsemun\"\nFrom dunionsemun.U:\n\nThis variable conditionally defines \"HASUNIONSEMUN\" if the union semun is defined by\nincluding .\n\n\"dunlinkat\"\nFrom dfsat.U:\n\nThis variable conditionally defines the \"HASUNLINKAT\" symbol, which indicates the \"POSIX\"\nunlinkat() function isavailable.\n\n\"dunordered\"\nFrom dunordered.U:\n\nThis variable conditionally defines the \"HASUNORDERED\" symbol, which indicates to the C\nprogram that the unordered() routine is available.\n\n\"dunsetenv\"\nFrom dunsetenv.U:\n\nThis variable conditionally defines the \"HASUNSETENV\" symbol, which indicates to the C\nprogram that the unsetenv () routine is available.\n\n\"duselocale\"\nFrom dnewlocale.U:\n\nThis variable conditionally defines the \"HASUSELOCALE\" symbol, which indicates to the C\nprogram that the uselocale() routine is available to set the current locale for the calling\nthread.\n\n\"dusleep\"\nFrom dusleep.U:\n\nThis variable conditionally defines \"HASUSLEEP\" if usleep() is available to do high\ngranularity sleeps.\n\n\"dusleepproto\"\nFrom dusleepproto.U:\n\nThis variable conditionally defines the \"HASUSLEEPPROTO\" symbol, which indicates to the C\nprogram that the system provides a prototype for the usleep() function. Otherwise, it is up\nto the program to supply one.\n\n\"dustat\"\nFrom dustat.U:\n\nThis variable conditionally defines \"HASUSTAT\" if ustat() is available to query file system\nstatistics by devt.\n\n\"dvendorarch\"\nFrom vendorarch.U:\n\nThis variable conditionally defined \"PERLVENDORARCH\".\n\n\"dvendorbin\"\nFrom vendorbin.U:\n\nThis variable conditionally defines \"PERLVENDORBIN\".\n\n\"dvendorlib\"\nFrom vendorlib.U:\n\nThis variable conditionally defines \"PERLVENDORLIB\".\n\n\"dvendorscript\"\nFrom vendorscript.U:\n\nThis variable conditionally defines \"PERLVENDORSCRIPT\".\n\n\"dvfork\"\nFrom dvfork.U:\n\nThis variable conditionally defines the \"HASVFORK\" symbol, which indicates the vfork()\nroutine is available.\n\n\"dvoidclosedir\"\nFrom dclosedir.U:\n\nThis variable conditionally defines \"VOIDCLOSEDIR\" if closedir() does not return a value.\n\n\"dvoidsig\"\nFrom dvoidsig.U:\n\nThis variable conditionally defines \"VOIDSIG\" if this system declares \"void\n(*signal(...))()\" in signal.h. The old way was to declare it as \"int (*signal(...))()\".\n\n\"dvoidtty\"\nFrom isysioctl.U:\n\nThis variable conditionally defines \"USEIOCNOTTY\" to indicate that the ioctl() call with\n\"TIOCNOTTY\" should be used to void tty association. Otherwise (on \"USG\" probably), it is\nenough to close the standard file descriptors and do a setpgrp().\n\n\"dvsnprintf\"\nFrom dsnprintf.U:\n\nThis variable conditionally defines the \"HASVSNPRINTF\" symbol, which indicates to the C\nprogram that the vsnprintf () library function is available.\n\n\"dwait4\"\nFrom dwait4.U:\n\nThis variable conditionally defines the HASWAIT4 symbol, which indicates the wait4()\nroutine is available.\n\n\"dwaitpid\"\nFrom dwaitpid.U:\n\nThis variable conditionally defines \"HASWAITPID\" if waitpid() is available to wait for\nchild process.\n\n\"dwcrtomb\"\nFrom dwcrtomb.U:\n\nThis variable conditionally defines the \"HASWCRTOMB\" symbol if the wcrtomb() routine is\navailable to be used to convert a wide character into a multi-byte character.\n\n\"dwcscmp\"\nFrom dwcscmp.U:\n\nThis variable conditionally defines the \"HASWCSCMP\" symbol if the wcscmp() routine is\navailable and can be used to compare wide character strings.\n\n\"dwcstombs\"\nFrom dwcstombs.U:\n\nThis variable conditionally defines the \"HASWCSTOMBS\" symbol, which indicates to the C\nprogram that the wcstombs() routine is available to convert wide character strings to\nmultibyte strings.\n\n\"dwcsxfrm\"\nFrom dwcsxfrm.U:\n\nThis variable conditionally defines the \"HASWCSXFRM\" symbol if the wcsxfrm() routine is\navailable and can be used to compare wide character strings.\n\n\"dwctomb\"\nFrom dwctomb.U:\n\nThis variable conditionally defines the \"HASWCTOMB\" symbol, which indicates to the C\nprogram that the wctomb() routine is available to convert a wide character to a multibyte.\n\n\"dwritev\"\nFrom dwritev.U:\n\nThis variable conditionally defines the \"HASWRITEV\" symbol, which indicates to the C\nprogram that the writev() routine is available.\n\n\"dxenix\"\nFrom Guess.U:\n\nThis variable conditionally defines the symbol \"XENIX\", which alerts the C program that it\nruns under Xenix.\n\n\"date\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ndate program. After Configure runs, the value is reset to a plain \"date\" and is not useful.\n\n\"dbhashtype\"\nFrom idb.U:\n\nThis variable contains the type of the hash structure element in the header file. In\nolder versions of \"DB\", it was int, while in newer ones it is uint32t.\n\n\"dbprefixtype\"\nFrom idb.U:\n\nThis variable contains the type of the prefix structure element in the header file.\nIn older versions of \"DB\", it was int, while in newer ones it is sizet.\n\n\"dbversionmajor\"\nFrom idb.U:\n\nThis variable contains the major version number of Berkeley \"DB\" found in the header\nfile.\n\n\"dbversionminor\"\nFrom idb.U:\n\nThis variable contains the minor version number of Berkeley \"DB\" found in the header\nfile. For \"DB\" version 1 this is always 0.\n\n\"dbversionpatch\"\nFrom idb.U:\n\nThis variable contains the patch version number of Berkeley \"DB\" found in the header\nfile. For \"DB\" version 1 this is always 0.\n\n\"defaultincexcludesdot\"\nFrom defaultincdot.U:\n\nWhen defined, remove the legacy . from @\"INC\"\n\n\"direntrytype\"\nFrom idirent.U:\n\nThis symbol is set to \"struct direct\" or \"struct dirent\" depending on whether dirent is\navailable or not. You should use this pseudo type to portably declare your directory\nentries.\n\n\"dlext\"\nFrom dlext.U:\n\nThis variable contains the extension that is to be used for the dynamically loaded modules\nthat perl generates.\n\n\"dlsrc\"\nFrom dlsrc.U:\n\nThis variable contains the name of the dynamic loading file that will be used with the\npackage.\n\n\"doubleinfbytes\"\nFrom infnan.U:\n\nThis variable contains comma-separated list of hexadecimal bytes for the double precision\ninfinity.\n\n\"doublekind\"\nFrom longdblfio.U:\n\nThis variable, if defined, encodes the type of a double: 1 = \"IEEE\" 754 32-bit little\nendian, 2 = \"IEEE\" 754 32-bit big endian, 3 = \"IEEE\" 754 64-bit little endian, 4 = \"IEEE\"\n754 64-bit big endian, 5 = \"IEEE\" 754 128-bit little endian, 6 = \"IEEE\" 754 128-bit big\nendian, 7 = \"IEEE\" 754 64-bit mixed endian le-be, 8 = \"IEEE\" 754 64-bit mixed endian be-le,\n9 = \"VAX\" 32bit little endian F float format 10 = \"VAX\" 64bit little endian D float format\n11 = \"VAX\" 64bit little endian G float format 12 = \"IBM\" 32bit format 13 = \"IBM\" 64bit\nformat 14 = Cray 64bit format -1 = unknown format.\n\n\"doublemantbits\"\nFrom mantbits.U:\n\nThis symbol, if defined, tells how many mantissa bits there are in double precision floating\npoint format. Note that this is usually \"DBLMANTDIG\" minus one, since with the standard\n\"IEEE\" 754 formats \"DBLMANTDIG\" includes the implicit bit which doesn't really exist.\n\n\"doublenanbytes\"\nFrom infnan.U:\n\nThis variable contains comma-separated list of hexadecimal bytes for the double precision\nnot-a-number.\n\n\"doublesize\"\nFrom doublesize.U:\n\nThis variable contains the value of the \"DOUBLESIZE\" symbol, which indicates to the C\nprogram how many bytes there are in a double.\n\n\"drand01\"\nFrom randfunc.U:\n\nIndicates the macro to be used to generate normalized random numbers. Uses randfunc, often\ndivided by (double) (((unsigned long) 1 << randbits)) in order to normalize the result. In C\nprograms, the macro \"Drand01\" is mapped to drand01.\n\n\"drand48rproto\"\nFrom ddrand48r.U:\n\nThis variable encodes the prototype of drand48r. It is zero if ddrand48r is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if ddrand48r is defined.\n\n\"dtrace\"\nFrom usedtrace.U:\n\nThis variable holds the location of the dtrace executable.\n\n\"dtraceobject\"\nFrom dtraceobject.U:\n\nWhether we need to build an object file with the dtrace tool.\n\n\"dtracexnolibs\"\nFrom dtraceobject.U:\n\nWhether dtrace accepts -xnolibs. If available we call dtrace -h and dtrace -G with -xnolibs\nto allow dtrace to run in a jail on FreeBSD.\n\n\"dynamicext\"\nFrom Extensions.U:\n\nThis variable holds a list of \"XS\" extension files we want to link dynamically into the\npackage. It is used by Makefile.\n\ne\n\"eagain\"\nFrom nblockio.U:\n\nThis variable bears the symbolic errno code set by read() when no data is present on the\nfile and non-blocking I/O was enabled (otherwise, read() blocks naturally).\n\n\"ebcdic\"\nFrom ebcdic.U:\n\nThis variable conditionally defines \"EBCDIC\" if this system uses \"EBCDIC\" encoding.\n\n\"echo\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\necho program. After Configure runs, the value is reset to a plain \"echo\" and is not useful.\n\n\"egrep\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\negrep program. After Configure runs, the value is reset to a plain \"egrep\" and is not\nuseful.\n\n\"emacs\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"endgrentrproto\"\nFrom dendgrentr.U:\n\nThis variable encodes the prototype of endgrentr. It is zero if dendgrentr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dendgrentr is defined.\n\n\"endhostentrproto\"\nFrom dendhostentr.U:\n\nThis variable encodes the prototype of endhostentr. It is zero if dendhostentr is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dendhostentr is defined.\n\n\"endnetentrproto\"\nFrom dendnetentr.U:\n\nThis variable encodes the prototype of endnetentr. It is zero if dendnetentr is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dendnetentr is defined.\n\n\"endprotoentrproto\"\nFrom dendprotoentr.U:\n\nThis variable encodes the prototype of endprotoentr. It is zero if dendprotoentr is\nundef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dendprotoentr is\ndefined.\n\n\"endpwentrproto\"\nFrom dendpwentr.U:\n\nThis variable encodes the prototype of endpwentr. It is zero if dendpwentr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dendpwentr is defined.\n\n\"endserventrproto\"\nFrom dendserventr.U:\n\nThis variable encodes the prototype of endserventr. It is zero if dendserventr is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dendserventr is defined.\n\n\"eunicefix\"\nFrom Init.U:\n\nWhen running under Eunice this variable contains a command which will convert a shell script\nto the proper form of text file for it to be executable by the shell. On other systems it is\na no-op.\n\n\"exeext\"\nFrom Unix.U:\n\nThis is an old synonym for exe.\n\n\"expr\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nexpr program. After Configure runs, the value is reset to a plain \"expr\" and is not useful.\n\n\"extensions\"\nFrom Extensions.U:\n\nThis variable holds a list of all extension files (both \"XS\" and non-xs) installed with the\npackage. It is propagated to Config.pm and is typically used to test whether a particular\nextension is available.\n\n\"externC\"\nFrom Csym.U:\n\n\"ANSI\" C requires \"extern\" where C++ requires 'extern \"C\"'. This variable can be used in\nConfigure to do the right thing.\n\n\"extras\"\nFrom Extras.U:\n\nThis variable holds a list of extra modules to install.\n\nf\n\"fflushall\"\nFrom fflushall.U:\n\nThis symbol, if defined, tells that to flush all pending stdio output one must loop through\nall the stdio file handles stored in an array and fflush them. Note that if fflushNULL is\ndefined, fflushall will not even be probed for and will be left undefined.\n\n\"fflushNULL\"\nFrom fflushall.U:\n\nThis symbol, if defined, tells that fflush(\"NULL\") correctly flushes all pending stdio\noutput without side effects. In particular, on some platforms calling fflush(\"NULL\") *still*\ncorrupts \"STDIN\" if it is a pipe.\n\n\"find\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"firstmakefile\"\nFrom Unix.U:\n\nThis variable defines the first file searched by make. On unix, it is makefile (then\nMakefile). On case-insensitive systems, it might be something else. This is only used to\ndeal with convoluted make depend tricks.\n\n\"flex\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"fpossize\"\nFrom fpossize.U:\n\nThis variable contains the size of a fpostype in bytes.\n\n\"fpostype\"\nFrom fpostype.U:\n\nThis variable defines Fpost to be something like fpost, long, uint, or whatever type is\nused to declare file positions in libc.\n\n\"freetype\"\nFrom mallocsrc.U:\n\nThis variable contains the return type of free(). It is usually void, but occasionally int.\n\n\"from\"\nFrom Cross.U:\n\nThis variable contains the command used by Configure to copy files from the target host.\nUseful and available only during Perl build. The string \":\" if not cross-compiling.\n\n\"fullar\"\nFrom Locar.U:\n\nThis variable contains the full pathname to \"ar\", whether or not the user has specified\n\"portability\". This is only used in the Makefile.SH.\n\n\"fullcsh\"\nFrom dcsh.U:\n\nThis variable contains the full pathname to \"csh\", whether or not the user has specified\n\"portability\". This is only used in the compiled C program, and we assume that all systems\nwhich can share this executable will have the same full pathname to csh.\n\n\"fullsed\"\nFrom Locsed.U:\n\nThis variable contains the full pathname to \"sed\", whether or not the user has specified\n\"portability\". This is only used in the compiled C program, and we assume that all systems\nwhich can share this executable will have the same full pathname to sed.\n\ng\n\"gccansipedantic\"\nFrom gccvers.U:\n\nIf \"GNU\" cc (gcc) is used, this variable will enable (if set) the -ansi and -pedantic\nccflags for building core files (through cflags script). (See Porting/pumpkin.pod for full\ndescription).\n\n\"gccosandvers\"\nFrom gccvers.U:\n\nIf \"GNU\" cc (gcc) is used, this variable holds the operating system and version used to\ncompile gcc. It is set to '' if not gcc, or if nothing useful can be parsed as the os\nversion.\n\n\"gccversion\"\nFrom gccvers.U:\n\nIf \"GNU\" cc (gcc) is used, this variable holds 1 or 2 to indicate whether the compiler is\nversion 1 or 2. This is used in setting some of the default cflags. It is set to '' if not\ngcc.\n\n\"getgrentrproto\"\nFrom dgetgrentr.U:\n\nThis variable encodes the prototype of getgrentr. It is zero if dgetgrentr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetgrentr is defined.\n\n\"getgrgidrproto\"\nFrom dgetgrgidr.U:\n\nThis variable encodes the prototype of getgrgidr. It is zero if dgetgrgidr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetgrgidr is defined.\n\n\"getgrnamrproto\"\nFrom dgetgrnamr.U:\n\nThis variable encodes the prototype of getgrnamr. It is zero if dgetgrnamr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetgrnamr is defined.\n\n\"gethostbyaddrrproto\"\nFrom dgethostbyaddrr.U:\n\nThis variable encodes the prototype of gethostbyaddrr. It is zero if dgethostbyaddrr is\nundef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgethostbyaddrr is\ndefined.\n\n\"gethostbynamerproto\"\nFrom dgethostbynamer.U:\n\nThis variable encodes the prototype of gethostbynamer. It is zero if dgethostbynamer is\nundef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgethostbynamer is\ndefined.\n\n\"gethostentrproto\"\nFrom dgethostentr.U:\n\nThis variable encodes the prototype of gethostentr. It is zero if dgethostentr is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgethostentr is defined.\n\n\"getloginrproto\"\nFrom dgetloginr.U:\n\nThis variable encodes the prototype of getloginr. It is zero if dgetloginr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetloginr is defined.\n\n\"getnetbyaddrrproto\"\nFrom dgetnetbyaddrr.U:\n\nThis variable encodes the prototype of getnetbyaddrr. It is zero if dgetnetbyaddrr is\nundef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetnetbyaddrr is\ndefined.\n\n\"getnetbynamerproto\"\nFrom dgetnetbynamer.U:\n\nThis variable encodes the prototype of getnetbynamer. It is zero if dgetnetbynamer is\nundef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetnetbynamer is\ndefined.\n\n\"getnetentrproto\"\nFrom dgetnetentr.U:\n\nThis variable encodes the prototype of getnetentr. It is zero if dgetnetentr is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetnetentr is defined.\n\n\"getprotobynamerproto\"\nFrom dgetprotobynamer.U:\n\nThis variable encodes the prototype of getprotobynamer. It is zero if dgetprotobynamer is\nundef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetprotobynamer is\ndefined.\n\n\"getprotobynumberrproto\"\nFrom dgetprotobynumberr.U:\n\nThis variable encodes the prototype of getprotobynumberr. It is zero if\ndgetprotobynumberr is undef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if\ndgetprotobynumberr is defined.\n\n\"getprotoentrproto\"\nFrom dgetprotoentr.U:\n\nThis variable encodes the prototype of getprotoentr. It is zero if dgetprotoentr is\nundef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetprotoentr is\ndefined.\n\n\"getpwentrproto\"\nFrom dgetpwentr.U:\n\nThis variable encodes the prototype of getpwentr. It is zero if dgetpwentr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetpwentr is defined.\n\n\"getpwnamrproto\"\nFrom dgetpwnamr.U:\n\nThis variable encodes the prototype of getpwnamr. It is zero if dgetpwnamr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetpwnamr is defined.\n\n\"getpwuidrproto\"\nFrom dgetpwuidr.U:\n\nThis variable encodes the prototype of getpwuidr. It is zero if dgetpwuidr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetpwuidr is defined.\n\n\"getservbynamerproto\"\nFrom dgetservbynamer.U:\n\nThis variable encodes the prototype of getservbynamer. It is zero if dgetservbynamer is\nundef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetservbynamer is\ndefined.\n\n\"getservbyportrproto\"\nFrom dgetservbyportr.U:\n\nThis variable encodes the prototype of getservbyportr. It is zero if dgetservbyportr is\nundef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetservbyportr is\ndefined.\n\n\"getserventrproto\"\nFrom dgetserventr.U:\n\nThis variable encodes the prototype of getserventr. It is zero if dgetserventr is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetserventr is defined.\n\n\"getspnamrproto\"\nFrom dgetspnamr.U:\n\nThis variable encodes the prototype of getspnamr. It is zero if dgetspnamr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dgetspnamr is defined.\n\n\"gidformat\"\nFrom gidf.U:\n\nThis variable contains the format string used for printing a Gidt.\n\n\"gidsign\"\nFrom gidsign.U:\n\nThis variable contains the signedness of a gidtype. 1 for unsigned, -1 for signed.\n\n\"gidsize\"\nFrom gidsize.U:\n\nThis variable contains the size of a gidtype in bytes.\n\n\"gidtype\"\nFrom gidtype.U:\n\nThis variable defines Gidt to be something like gidt, int, ushort, or whatever type is\nused to declare the return type of getgid(). Typically, it is the type of group ids in the\nkernel.\n\n\"glibpth\"\nFrom libpth.U:\n\nThis variable holds the general path (space-separated) used to find libraries. It may\ncontain directories that do not exist on this platform, libpth is the cleaned-up version.\n\n\"gmake\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ngmake program. After Configure runs, the value is reset to a plain \"gmake\" and is not\nuseful.\n\n\"gmtimerproto\"\nFrom dgmtimer.U:\n\nThis variable encodes the prototype of gmtimer. It is zero if dgmtimer is undef, and one\nof the \"REENTRANTPROTOTABC\" macros of reentr.h if dgmtimer is defined.\n\n\"gnulibcversion\"\nFrom dgnulibc.U:\n\nThis variable contains the version number of the \"GNU\" C library. It is usually something\nlike 2.2.5. It is a plain '' if this is not the \"GNU\" C library, or if the version is\nunknown.\n\n\"grep\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ngrep program. After Configure runs, the value is reset to a plain \"grep\" and is not useful.\n\n\"groupcat\"\nFrom nis.U:\n\nThis variable contains a command that produces the text of the /etc/group file. This is\nnormally \"cat /etc/group\", but can be \"ypcat group\" when \"NIS\" is used. On some systems,\nsuch as os390, there may be no equivalent command, in which case this variable is unset.\n\n\"groupstype\"\nFrom groupstype.U:\n\nThis variable defines Groupst to be something like gidt, int, ushort, or whatever type is\nused for the second argument to getgroups() and setgroups(). Usually, this is the same as\ngidtype (gidt), but sometimes it isn't.\n\n\"gzip\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ngzip program. After Configure runs, the value is reset to a plain \"gzip\" and is not useful.\n\nh\n\"hfcntl\"\nFrom hfcntl.U:\n\nThis is variable gets set in various places to tell ifcntl that should be\nincluded.\n\n\"hsysfile\"\nFrom hsysfile.U:\n\nThis is variable gets set in various places to tell isysfile that should be\nincluded.\n\n\"hint\"\nFrom Oldconfig.U:\n\nGives the type of hints used for previous answers. May be one of \"default\", \"recommended\" or\n\"previous\".\n\n\"hostcat\"\nFrom nis.U:\n\nThis variable contains a command that produces the text of the /etc/hosts file. This is\nnormally \"cat /etc/hosts\", but can be \"ypcat hosts\" when \"NIS\" is used. On some systems,\nsuch as os390, there may be no equivalent command, in which case this variable is unset.\n\n\"hostgenerate\"\nFrom Cross.U:\n\nThis variable contains the path to a generateuudmap binary that can be run on the host \"OS\"\nwhen cross-compiling. Useful and available only during Perl build. Empty string '' if not\ncross-compiling.\n\n\"hostosname\"\nFrom Cross.U:\n\nThis variable contains the original value of $^O for hostperl when cross-compiling. This is\nuseful to pick the proper tools when running build code in the host. Empty string '' if not\ncross-compiling.\n\n\"hostperl\"\nFrom Cross.U:\n\nThis variable contains the path to a miniperl binary that can be run on the host \"OS\" when\ncross-compiling. Useful and available only during Perl build. Empty string '' if not\ncross-compiling.\n\n\"html1dir\"\nFrom html1dir.U:\n\nThis variable contains the name of the directory in which html source pages are to be put.\nThis directory is for pages that describe whole programs, not libraries or modules. It is\nintended to correspond roughly to section 1 of the Unix manuals.\n\n\"html1direxp\"\nFrom html1dir.U:\n\nThis variable is the same as the html1dir variable, but is filename expanded at\nconfiguration time, for convenient use in makefiles.\n\n\"html3dir\"\nFrom html3dir.U:\n\nThis variable contains the name of the directory in which html source pages are to be put.\nThis directory is for pages that describe libraries or modules. It is intended to correspond\nroughly to section 3 of the Unix manuals.\n\n\"html3direxp\"\nFrom html3dir.U:\n\nThis variable is the same as the html3dir variable, but is filename expanded at\nconfiguration time, for convenient use in makefiles.\n\ni\n\"i16size\"\nFrom perlxv.U:\n\nThis variable is the size of an I16 in bytes.\n\n\"i16type\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's I16.\n\n\"i32size\"\nFrom perlxv.U:\n\nThis variable is the size of an I32 in bytes.\n\n\"i32type\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's I32.\n\n\"i64size\"\nFrom perlxv.U:\n\nThis variable is the size of an I64 in bytes.\n\n\"i64type\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's I64.\n\n\"i8size\"\nFrom perlxv.U:\n\nThis variable is the size of an I8 in bytes.\n\n\"i8type\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's I8.\n\n\"iarpainet\"\nFrom iarpainet.U:\n\nThis variable conditionally defines the \"IARPAINET\" symbol, and indicates whether a C\nprogram should include .\n\n\"ibfd\"\nFrom ibfd.U:\n\nThis variable conditionally defines the \"IBFD\" symbol, and indicates whether a C program\ncan include .\n\n\"ibsdioctl\"\nFrom isysioctl.U:\n\nThis variable conditionally defines the \"ISYSBSDIOCTL\" symbol, which indicates to the C\nprogram that exists and should be included.\n\n\"icrypt\"\nFrom icrypt.U:\n\nThis variable conditionally defines the \"ICRYPT\" symbol, and indicates whether a C program\nshould include .\n\n\"idb\"\nFrom idb.U:\n\nThis variable conditionally defines the \"IDB\" symbol, and indicates whether a C program may\ninclude Berkeley's \"DB\" include file .\n\n\"idbm\"\nFrom idbm.U:\n\nThis variable conditionally defines the \"IDBM\" symbol, which indicates to the C program\nthat exists and should be included.\n\n\"idirent\"\nFrom idirent.U:\n\nThis variable conditionally defines \"IDIRENT\", which indicates to the C program that it\nshould include .\n\n\"idlfcn\"\nFrom idlfcn.U:\n\nThis variable conditionally defines the \"IDLFCN\" symbol, which indicates to the C program\nthat exists and should be included.\n\n\"iexecinfo\"\nFrom iexecinfo.U:\n\nThis variable conditionally defines the \"IEXECINFO\" symbol, and indicates whether a C\nprogram may include , for backtrace() support.\n\n\"ifcntl\"\nFrom ifcntl.U:\n\nThis variable controls the value of \"IFCNTL\" (which tells the C program to include\n).\n\n\"ifenv\"\nFrom ifenv.U:\n\nThis variable conditionally defines the \"IFENV\" symbol, which indicates to the C program\nthat exists and should be included.\n\n\"ifp\"\nFrom ifp.U:\n\nThis variable conditionally defines the \"IFP\" symbol, and indicates whether a C program\nshould include .\n\n\"ifpclass\"\nFrom ifpclass.U:\n\nThis variable conditionally defines the \"IFPCLASS\" symbol, and indicates whether a C\nprogram should include .\n\n\"igdbm\"\nFrom igdbm.U:\n\nThis variable conditionally defines the \"IGDBM\" symbol, which indicates to the C program\nthat exists and should be included.\n\n\"igdbmndbm\"\nFrom indbm.U:\n\nThis variable conditionally defines the \"IGDBMNDBM\" symbol, which indicates to the C\nprogram that exists and should be included. This is the location of the ndbm.h\ncompatibility file in Debian 4.0.\n\n\"igdbmndbm\"\nFrom indbm.U:\n\nThis variable conditionally defines the \"IGDBMNDBM\" symbol, which indicates to the C\nprogram that exists and should be included. This was the location of the\nndbm.h compatibility file in RedHat 7.1.\n\n\"igrp\"\nFrom igrp.U:\n\nThis variable conditionally defines the \"IGRP\" symbol, and indicates whether a C program\nshould include .\n\n\"iieeefp\"\nFrom iieeefp.U:\n\nThis variable conditionally defines the \"IIEEEFP\" symbol, and indicates whether a C program\nshould include .\n\n\"iinttypes\"\nFrom iinttypes.U:\n\nThis variable conditionally defines the \"IINTTYPES\" symbol, and indicates whether a C\nprogram should include .\n\n\"ilanginfo\"\nFrom ilanginfo.U:\n\nThis variable conditionally defines the \"ILANGINFO\" symbol, and indicates whether a C\nprogram should include .\n\n\"ilibutil\"\nFrom ilibutil.U:\n\nThis variable conditionally defines the \"ILIBUTIL\" symbol, and indicates whether a C\nprogram should include .\n\n\"ilocale\"\nFrom ilocale.U:\n\nThis variable conditionally defines the \"ILOCALE\" symbol, and indicates whether a C program\nshould include .\n\n\"imachcthr\"\nFrom imachcthr.U:\n\nThis variable conditionally defines the \"IMACHCTHREADS\" symbol, and indicates whether a C\nprogram should include .\n\n\"imalloc\"\nFrom imalloc.U:\n\nThis variable conditionally defines the \"IMALLOC\" symbol, and indicates whether a C program\nshould include .\n\n\"imallocmalloc\"\nFrom imallocmalloc.U:\n\nThis variable conditionally defines the \"IMALLOCMALLOC\" symbol, and indicates whether a C\nprogram should include .\n\n\"imntent\"\nFrom imntent.U:\n\nThis variable conditionally defines the \"IMNTENT\" symbol, and indicates whether a C program\nshould include .\n\n\"indbm\"\nFrom indbm.U:\n\nThis variable conditionally defines the \"INDBM\" symbol, which indicates to the C program\nthat exists and should be included.\n\n\"inetdb\"\nFrom inetdb.U:\n\nThis variable conditionally defines the \"INETDB\" symbol, and indicates whether a C program\nshould include .\n\n\"ineterrno\"\nFrom ineterrno.U:\n\nThis variable conditionally defines the \"INETERRNO\" symbol, which indicates to the C\nprogram that exists and should be included.\n\n\"inetinettcp\"\nFrom inetinettcp.U:\n\nThis variable conditionally defines the \"INETINETTCP\" symbol, and indicates whether a C\nprogram should include .\n\n\"iniin\"\nFrom iniin.U:\n\nThis variable conditionally defines \"INETINETIN\", which indicates to the C program that it\nshould include . Otherwise, you may try .\n\n\"ipoll\"\nFrom ipoll.U:\n\nThis variable conditionally defines the \"IPOLL\" symbol, and indicates whether a C program\nshould include .\n\n\"iprot\"\nFrom iprot.U:\n\nThis variable conditionally defines the \"IPROT\" symbol, and indicates whether a C program\nshould include .\n\n\"ipthread\"\nFrom ipthread.U:\n\nThis variable conditionally defines the \"IPTHREAD\" symbol, and indicates whether a C\nprogram should include .\n\n\"ipwd\"\nFrom ipwd.U:\n\nThis variable conditionally defines \"IPWD\", which indicates to the C program that it should\ninclude .\n\n\"iquadmath\"\nFrom iquadmath.U:\n\nThis variable conditionally defines \"IQUADMATH\", which indicates to the C program that it\nshould include .\n\n\"irpcsvcdbm\"\nFrom idbm.U:\n\nThis variable conditionally defines the \"IRPCSVCDBM\" symbol, which indicates to the C\nprogram that exists and should be included. Some System V systems might need\nthis instead of .\n\n\"isgtty\"\nFrom itermio.U:\n\nThis variable conditionally defines the \"ISGTTY\" symbol, which indicates to the C program\nthat it should include rather than .\n\n\"ishadow\"\nFrom ishadow.U:\n\nThis variable conditionally defines the \"ISHADOW\" symbol, and indicates whether a C program\nshould include .\n\n\"isocks\"\nFrom isocks.U:\n\nThis variable conditionally defines the \"ISOCKS\" symbol, and indicates whether a C program\nshould include .\n\n\"istdbool\"\nFrom istdbool.U:\n\nThis variable conditionally defines the \"ISTDBOOL\" symbol, which indicates to the C program\nthat exists and should be included.\n\n\"istdint\"\nFrom istdint.U:\n\nThis variable conditionally defines the \"ISTDINT\" symbol, which indicates to the C program\nthat exists and should be included.\n\n\"istdlib\"\nFrom istdlib.U:\n\nThis variable unconditionally defines the \"ISTDLIB\" symbol.\n\n\"isunmath\"\nFrom isunmath.U:\n\nThis variable conditionally defines the \"ISUNMATH\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysaccess\"\nFrom isysaccess.U:\n\nThis variable conditionally defines the \"ISYSACCESS\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysdir\"\nFrom isysdir.U:\n\nThis variable conditionally defines the \"ISYSDIR\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysfile\"\nFrom isysfile.U:\n\nThis variable conditionally defines the \"ISYSFILE\" symbol, and indicates whether a C\nprogram should include to get \"ROK\" and friends.\n\n\"isysfilio\"\nFrom isysioctl.U:\n\nThis variable conditionally defines the \"ISYSFILIO\" symbol, which indicates to the C\nprogram that exists and should be included in preference to .\n\n\"isysin\"\nFrom iniin.U:\n\nThis variable conditionally defines \"ISYSIN\", which indicates to the C program that it\nshould include instead of .\n\n\"isysioctl\"\nFrom isysioctl.U:\n\nThis variable conditionally defines the \"ISYSIOCTL\" symbol, which indicates to the C\nprogram that exists and should be included.\n\n\"isyslog\"\nFrom isyslog.U:\n\nThis variable conditionally defines the \"ISYSLOG\" symbol, and indicates whether a C program\nshould include .\n\n\"isysmman\"\nFrom isysmman.U:\n\nThis variable conditionally defines the \"ISYSMMAN\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysmode\"\nFrom isysmode.U:\n\nThis variable conditionally defines the \"ISYSMODE\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysmount\"\nFrom isysmount.U:\n\nThis variable conditionally defines the \"ISYSMOUNT\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysndir\"\nFrom isysndir.U:\n\nThis variable conditionally defines the \"ISYSNDIR\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysparam\"\nFrom isysparam.U:\n\nThis variable conditionally defines the \"ISYSPARAM\" symbol, and indicates whether a C\nprogram should include .\n\n\"isyspoll\"\nFrom isyspoll.U:\n\nThis variable conditionally defines the \"ISYSPOLL\" symbol, which indicates to the C\nprogram that it should include .\n\n\"isysresrc\"\nFrom isysresrc.U:\n\nThis variable conditionally defines the \"ISYSRESOURCE\" symbol, and indicates whether a C\nprogram should include .\n\n\"isyssecrt\"\nFrom isyssecrt.U:\n\nThis variable conditionally defines the \"ISYSSECURITY\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysselct\"\nFrom isysselct.U:\n\nThis variable conditionally defines \"ISYSSELECT\", which indicates to the C program that it\nshould include in order to get the definition of struct timeval.\n\n\"isyssockio\"\nFrom isysioctl.U:\n\nThis variable conditionally defines \"ISYSSOCKIO\" to indicate to the C program that socket\nioctl codes may be found in instead of .\n\n\"isysstat\"\nFrom isysstat.U:\n\nThis variable conditionally defines the \"ISYSSTAT\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysstatfs\"\nFrom isysstatfs.U:\n\nThis variable conditionally defines the \"ISYSSTATFS\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysstatvfs\"\nFrom isysstatvfs.U:\n\nThis variable conditionally defines the \"ISYSSTATVFS\" symbol, and indicates whether a C\nprogram should include .\n\n\"isystime\"\nFrom itime.U:\n\nThis variable conditionally defines \"ISYSTIME\", which indicates to the C program that it\nshould include .\n\n\"isystimek\"\nFrom itime.U:\n\nThis variable conditionally defines \"ISYSTIMEKERNEL\", which indicates to the C program\nthat it should include with \"KERNEL\" defined.\n\n\"isystimes\"\nFrom isystimes.U:\n\nThis variable conditionally defines the \"ISYSTIMES\" symbol, and indicates whether a C\nprogram should include .\n\n\"isystypes\"\nFrom isystypes.U:\n\nThis variable conditionally defines the \"ISYSTYPES\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysuio\"\nFrom isysuio.U:\n\nThis variable conditionally defines the \"ISYSUIO\" symbol, and indicates whether a C program\nshould include .\n\n\"isysun\"\nFrom isysun.U:\n\nThis variable conditionally defines \"ISYSUN\", which indicates to the C program that it\nshould include to get \"UNIX\" domain socket definitions.\n\n\"isysutsname\"\nFrom isysutsname.U:\n\nThis variable conditionally defines the \"ISYSUTSNAME\" symbol, and indicates whether a C\nprogram should include .\n\n\"isysvfs\"\nFrom isysvfs.U:\n\nThis variable conditionally defines the \"ISYSVFS\" symbol, and indicates whether a C program\nshould include .\n\n\"isyswait\"\nFrom isyswait.U:\n\nThis variable conditionally defines \"ISYSWAIT\", which indicates to the C program that it\nshould include .\n\n\"itermio\"\nFrom itermio.U:\n\nThis variable conditionally defines the \"ITERMIO\" symbol, which indicates to the C program\nthat it should include rather than .\n\n\"itermios\"\nFrom itermio.U:\n\nThis variable conditionally defines the \"ITERMIOS\" symbol, which indicates to the C program\nthat the \"POSIX\" file is to be included.\n\n\"itime\"\nFrom itime.U:\n\nThis variable unconditionally defines \"ITIME\", which indicates to the C program that it\nshould include .\n\n\"iunistd\"\nFrom iunistd.U:\n\nThis variable conditionally defines the \"IUNISTD\" symbol, and indicates whether a C program\nshould include .\n\n\"iustat\"\nFrom iustat.U:\n\nThis variable conditionally defines the \"IUSTAT\" symbol, and indicates whether a C program\nshould include .\n\n\"iutime\"\nFrom iutime.U:\n\nThis variable conditionally defines the \"IUTIME\" symbol, and indicates whether a C program\nshould include .\n\n\"ivfork\"\nFrom ivfork.U:\n\nThis variable conditionally defines the \"IVFORK\" symbol, and indicates whether a C program\nshould include vfork.h.\n\n\"iwchar\"\nFrom iwchar.U:\n\nThis variable conditionally defines the \"IWCHAR\" symbol, that indicates whether a C program\nmay include .\n\n\"iwctype\"\nFrom iwctype.U:\n\nThis variable conditionally defines the \"IWCTYPE\" symbol, that indicates whether a C\nprogram may include .\n\n\"ixlocale\"\nFrom dnewlocale.U:\n\nThis symbol, if defined, indicates to the C program that it should include to\nget uselocale() and its friends\n\n\"ignoreversionedsolibs\"\nFrom libs.U:\n\nThis variable should be non-empty if non-versioned shared libraries (libfoo.so.x.y) are to\nbe ignored (because they cannot be linked against).\n\n\"incversionlist\"\nFrom incversionlist.U:\n\nThis variable specifies the list of subdirectories in over which perl.c:incpush() and\nlib/lib.pm will automatically search when adding directories to @\"INC\". The elements in the\nlist are separated by spaces. This is only useful if you have a perl library directory tree\nstructured like the default one. See \"INSTALL\" for how this works. The versioned siteperl\ndirectory was introduced in 5.005, so that is the lowest possible value.\n\nThis list includes architecture-dependent directories back to version $apiversionstring\n(e.g. 5.5.640) and architecture-independent directories all the way back to 5.005.\n\n\"incversionlistinit\"\nFrom incversionlist.U:\n\nThis variable holds the same list as incversionlist, but each item is enclosed in double\nquotes and separated by commas, suitable for use in the \"PERLINCVERSIONLIST\"\ninitialization.\n\n\"incpath\"\nFrom usrinc.U:\n\nThis variable must precede the normal include path to get the right one, as in\n$incpath/usr/include or $incpath/usr/lib. Value can be \"\" or /bsd43 on mips.\n\n\"incpth\"\nFrom libpth.U:\n\nThis variable must precede the normal include path to get the right one, as in\n$incpath/usr/include or $incpath/usr/lib. Value can be \"\" or /bsd43 on mips.\n\n\"inews\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"initialinstalllocation\"\nFrom bin.U:\n\nWhen userelocatableinc is true, this variable holds the location that make install should\ncopy the perl binary to, with all the run-time relocatable paths calculated from this at\ninstall time. When used, it is initialized to the original value of binexp, and then binexp\nis set to .../, as the other binaries are found relative to the perl binary.\n\n\"installarchlib\"\nFrom archlib.U:\n\nThis variable is really the same as archlibexp but may differ on those systems using \"AFS\".\nFor extra portability, only this variable should be used in makefiles.\n\n\"installbin\"\nFrom bin.U:\n\nThis variable is the same as binexp unless \"AFS\" is running in which case the user is\nexplicitly prompted for it. This variable should always be used in your makefiles for\nmaximum portability.\n\n\"installhtml1dir\"\nFrom html1dir.U:\n\nThis variable is really the same as html1direxp, unless you are using a different\ninstallprefix. For extra portability, you should only use this variable within your\nmakefiles.\n\n\"installhtml3dir\"\nFrom html3dir.U:\n\nThis variable is really the same as html3direxp, unless you are using a different\ninstallprefix. For extra portability, you should only use this variable within your\nmakefiles.\n\n\"installman1dir\"\nFrom man1dir.U:\n\nThis variable is really the same as man1direxp, unless you are using \"AFS\" in which case it\npoints to the read/write location whereas man1direxp only points to the read-only access\nlocation. For extra portability, you should only use this variable within your makefiles.\n\n\"installman3dir\"\nFrom man3dir.U:\n\nThis variable is really the same as man3direxp, unless you are using \"AFS\" in which case it\npoints to the read/write location whereas man3direxp only points to the read-only access\nlocation. For extra portability, you should only use this variable within your makefiles.\n\n\"installprefix\"\nFrom installprefix.U:\n\nThis variable holds the name of the directory below which \"make install\" will install the\npackage. For most users, this is the same as prefix. However, it is useful for installing\nthe software into a different (usually temporary) location after which it can be bundled up\nand moved somehow to the final location specified by prefix.\n\n\"installprefixexp\"\nFrom installprefix.U:\n\nThis variable holds the full absolute path of installprefix with all ~-expansion done.\n\n\"installprivlib\"\nFrom privlib.U:\n\nThis variable is really the same as privlibexp but may differ on those systems using \"AFS\".\nFor extra portability, only this variable should be used in makefiles.\n\n\"installscript\"\nFrom scriptdir.U:\n\nThis variable is usually the same as scriptdirexp, unless you are on a system running \"AFS\",\nin which case they may differ slightly. You should always use this variable within your\nmakefiles for portability.\n\n\"installsitearch\"\nFrom sitearch.U:\n\nThis variable is really the same as sitearchexp but may differ on those systems using \"AFS\".\nFor extra portability, only this variable should be used in makefiles.\n\n\"installsitebin\"\nFrom sitebin.U:\n\nThis variable is usually the same as sitebinexp, unless you are on a system running \"AFS\",\nin which case they may differ slightly. You should always use this variable within your\nmakefiles for portability.\n\n\"installsitehtml1dir\"\nFrom sitehtml1dir.U:\n\nThis variable is really the same as sitehtml1direxp, unless you are using \"AFS\" in which\ncase it points to the read/write location whereas html1direxp only points to the read-only\naccess location. For extra portability, you should only use this variable within your\nmakefiles.\n\n\"installsitehtml3dir\"\nFrom sitehtml3dir.U:\n\nThis variable is really the same as sitehtml3direxp, unless you are using \"AFS\" in which\ncase it points to the read/write location whereas html3direxp only points to the read-only\naccess location. For extra portability, you should only use this variable within your\nmakefiles.\n\n\"installsitelib\"\nFrom sitelib.U:\n\nThis variable is really the same as sitelibexp but may differ on those systems using \"AFS\".\nFor extra portability, only this variable should be used in makefiles.\n\n\"installsiteman1dir\"\nFrom siteman1dir.U:\n\nThis variable is really the same as siteman1direxp, unless you are using \"AFS\" in which case\nit points to the read/write location whereas man1direxp only points to the read-only access\nlocation. For extra portability, you should only use this variable within your makefiles.\n\n\"installsiteman3dir\"\nFrom siteman3dir.U:\n\nThis variable is really the same as siteman3direxp, unless you are using \"AFS\" in which case\nit points to the read/write location whereas man3direxp only points to the read-only access\nlocation. For extra portability, you should only use this variable within your makefiles.\n\n\"installsitescript\"\nFrom sitescript.U:\n\nThis variable is usually the same as sitescriptexp, unless you are on a system running\n\"AFS\", in which case they may differ slightly. You should always use this variable within\nyour makefiles for portability.\n\n\"installstyle\"\nFrom installstyle.U:\n\nThis variable describes the \"style\" of the perl installation. This is intended to be useful\nfor tools that need to manipulate entire perl distributions. Perl itself doesn't use this to\nfind its libraries -- the library directories are stored directly in Config.pm. Currently,\nthere are only two styles: \"lib\" and lib/perl5. The default library locations (e.g. privlib,\nsitelib) are either $prefix/lib or $prefix/lib/perl5. The former is useful if $prefix is a\ndirectory dedicated to perl (e.g. /opt/perl), while the latter is useful if $prefix is\nshared by many packages, e.g. if $prefix=/usr/local.\n\nUnfortunately, while this \"style\" variable is used to set defaults for all three directory\nhierarchies (core, vendor, and site), there is no guarantee that the same style is actually\nappropriate for all those directories. For example, $prefix might be /opt/perl, but\n$siteprefix might be /usr/local. (Perhaps, in retrospect, the \"lib\" style should never have\nbeen supported, but it did seem like a nice idea at the time.)\n\nThe situation is even less clear for tools such as MakeMaker that can be used to install\nadditional modules into non-standard places. For example, if a user intends to install a\nmodule into a private directory (perhaps by setting \"PREFIX\" on the Makefile.PL command\nline), then there is no reason to assume that the Configure-time $installstyle setting will\nbe relevant for that \"PREFIX\".\n\nThis may later be extended to include other information, so be careful with pattern-matching\non the results.\n\nFor compatibility with perl5.005 and earlier, the default setting is based on whether or not\n$prefix contains the string \"perl\".\n\n\"installusrbinperl\"\nFrom instubperl.U:\n\nThis variable tells whether Perl should be installed also as /usr/bin/perl in addition to\n$installbin/perl\n\n\"installvendorarch\"\nFrom vendorarch.U:\n\nThis variable is really the same as vendorarchexp but may differ on those systems using\n\"AFS\". For extra portability, only this variable should be used in makefiles.\n\n\"installvendorbin\"\nFrom vendorbin.U:\n\nThis variable is really the same as vendorbinexp but may differ on those systems using\n\"AFS\". For extra portability, only this variable should be used in makefiles.\n\n\"installvendorhtml1dir\"\nFrom vendorhtml1dir.U:\n\nThis variable is really the same as vendorhtml1direxp but may differ on those systems using\n\"AFS\". For extra portability, only this variable should be used in makefiles.\n\n\"installvendorhtml3dir\"\nFrom vendorhtml3dir.U:\n\nThis variable is really the same as vendorhtml3direxp but may differ on those systems using\n\"AFS\". For extra portability, only this variable should be used in makefiles.\n\n\"installvendorlib\"\nFrom vendorlib.U:\n\nThis variable is really the same as vendorlibexp but may differ on those systems using\n\"AFS\". For extra portability, only this variable should be used in makefiles.\n\n\"installvendorman1dir\"\nFrom vendorman1dir.U:\n\nThis variable is really the same as vendorman1direxp but may differ on those systems using\n\"AFS\". For extra portability, only this variable should be used in makefiles.\n\n\"installvendorman3dir\"\nFrom vendorman3dir.U:\n\nThis variable is really the same as vendorman3direxp but may differ on those systems using\n\"AFS\". For extra portability, only this variable should be used in makefiles.\n\n\"installvendorscript\"\nFrom vendorscript.U:\n\nThis variable is really the same as vendorscriptexp but may differ on those systems using\n\"AFS\". For extra portability, only this variable should be used in makefiles.\n\n\"intsize\"\nFrom intsize.U:\n\nThis variable contains the value of the \"INTSIZE\" symbol, which indicates to the C program\nhow many bytes there are in an int.\n\n\"issymlink\"\nFrom issymlink.U:\n\nThis variable holds the test command to test for a symbolic link (if they are supported).\nTypical values include \"test -h\" and \"test -L\".\n\n\"ivdformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"IV\" as a signed decimal\ninteger.\n\n\"ivsize\"\nFrom perlxv.U:\n\nThis variable is the size of an \"IV\" in bytes.\n\n\"ivtype\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's \"IV\".\n\nk\n\"knownextensions\"\nFrom Extensions.U:\n\nThis variable holds a list of all extensions (both \"XS\" and non-xs) included in the package\nsource distribution. This information is only really of use during the Perl build, as the\nlist makes no distinction between extensions which were build and installed, and those which\nwhere not. See \"extensions\" for the list of extensions actually built and available.\n\n\"ksh\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\nl\n\"ld\"\nFrom dlsrc.U:\n\nThis variable indicates the program to be used to link libraries for dynamic loading. On\nsome systems, it is \"ld\". On \"ELF\" systems, it should be $cc. Mostly, we'll try to respect\nthe hint file setting.\n\n\"ldcanscript\"\nFrom dlsrc.U:\n\nThis variable shows if the loader accepts scripts in the form of\n-Wl,--version-script=ld.script. This is currently only supported for \"GNU\" ld on \"ELF\" in\ndynamic loading builds.\n\n\"lddlflags\"\nFrom dlsrc.U:\n\nThis variable contains any special flags that might need to be passed to $ld to create a\nshared library suitable for dynamic loading. It is up to the makefile to use it. For hpux,\nit should be \"-b\". For sunos 4.1, it is empty.\n\n\"ldflags\"\nFrom ccflags.U:\n\nThis variable contains any additional C loader flags desired by the user. It is up to the\nMakefile to use this.\n\n\"ldflagsuselargefiles\"\nFrom uselfs.U:\n\nThis variable contains the loader flags needed by large file builds and added to ldflags by\nhints files.\n\n\"ldlibpthname\"\nFrom libperl.U:\n\nThis variable holds the name of the shared library search path, often \"LDLIBRARYPATH\". To\nget an empty string, the hints file must set this to \"none\".\n\n\"less\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nless program. After Configure runs, the value is reset to a plain \"less\" and is not useful.\n\n\"libext\"\nFrom Unix.U:\n\nThis is an old synonym for a.\n\n\"libc\"\nFrom libc.U:\n\nThis variable contains the location of the C library.\n\n\"libperl\"\nFrom libperl.U:\n\nThe perl executable is obtained by linking perlmain.c with libperl, any static extensions\n(usually just DynaLoader), and any other libraries needed on this system. libperl is usually\nlibperl.a, but can also be libperl.so.xxx if the user wishes to build a perl executable with\na shared library.\n\n\"libpth\"\nFrom libpth.U:\n\nThis variable holds the general path (space-separated) used to find libraries. It is\nintended to be used by other units.\n\n\"libs\"\nFrom libs.U:\n\nThis variable holds the additional libraries we want to use. It is up to the Makefile to\ndeal with it. The list can be empty.\n\n\"libsdirs\"\nFrom libs.U:\n\nThis variable holds the directory names aka dirnames of the libraries we found and accepted,\nduplicates are removed.\n\n\"libsfiles\"\nFrom libs.U:\n\nThis variable holds the filenames aka basenames of the libraries we found and accepted.\n\n\"libsfound\"\nFrom libs.U:\n\nThis variable holds the full pathnames of the libraries we found and accepted.\n\n\"libspath\"\nFrom libs.U:\n\nThis variable holds the directory names probed for libraries.\n\n\"libswanted\"\nFrom Myinit.U:\n\nThis variable holds a list of all the libraries we want to search. The order is chosen to\npick up the c library ahead of ucb or bsd libraries for SVR4.\n\n\"libswanteduselargefiles\"\nFrom uselfs.U:\n\nThis variable contains the libraries needed by large file builds and added to ldflags by\nhints files. It is a space separated list of the library names without the \"lib\" prefix or\nany suffix, just like libswanted..\n\n\"line\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"lint\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"lkflags\"\nFrom ccflags.U:\n\nThis variable contains any additional C partial linker flags desired by the user. It is up\nto the Makefile to use this.\n\n\"ln\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nln program. After Configure runs, the value is reset to a plain \"ln\" and is not useful.\n\n\"lns\"\nFrom lns.U:\n\nThis variable holds the name of the command to make symbolic links (if they are supported).\nIt can be used in the Makefile. It is either \"ln -s\" or \"ln\"\n\n\"localtimerproto\"\nFrom dlocaltimer.U:\n\nThis variable encodes the prototype of localtimer. It is zero if dlocaltimer is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dlocaltimer is defined.\n\n\"locincpth\"\nFrom ccflags.U:\n\nThis variable contains a list of additional directories to be searched by the compiler. The\nappropriate \"-I\" directives will be added to ccflags. This is intended to simplify setting\nlocal directories from the Configure command line. It's not much, but it parallels the\nloclibpth stuff in libpth.U.\n\n\"loclibpth\"\nFrom libpth.U:\n\nThis variable holds the paths (space-separated) used to find local libraries. It is\nprepended to libpth, and is intended to be easily set from the command line.\n\n\"longdblinfbytes\"\nFrom infnan.U:\n\nThis variable contains comma-separated list of hexadecimal bytes for the long double\nprecision infinity.\n\n\"longdblkind\"\nFrom dlongdbl.U:\n\nThis variable, if defined, encodes the type of a long double: 0 = double, 1 = \"IEEE\" 754\n128-bit little endian, 2 = \"IEEE\" 754 128-bit big endian, 3 = x86 80-bit little endian, 4 =\nx86 80-bit big endian, 5 = double-double 128-bit little endian, 6 = double-double 128-bit\nbig endian, 7 = 128-bit mixed-endian double-double (64-bit LEs in \"BE\"), 8 = 128-bit\nmixed-endian double-double (64-bit BEs in \"LE\"), 9 = 128-bit \"PDP\"-style mixed-endian long\ndoubles, -1 = unknown format.\n\n\"longdblmantbits\"\nFrom mantbits.U:\n\nThis symbol, if defined, tells how many mantissa bits there are in long double precision\nfloating point format. Note that this can be \"LDBLMANTDIG\" minus one, since\n\"LDBLMANTDIG\" can include the \"IEEE\" 754 implicit bit. The common x86-style 80-bit long\ndouble does not have an implicit bit.\n\n\"longdblnanbytes\"\nFrom infnan.U:\n\nThis variable contains comma-separated list of hexadecimal bytes for the long double\nprecision not-a-number.\n\n\"longdblsize\"\nFrom dlongdbl.U:\n\nThis variable contains the value of the \"LONGDOUBLESIZE\" symbol, which indicates to the C\nprogram how many bytes there are in a long double, if this system supports long doubles.\nNote that this is sizeof(long double), which may include unused bytes.\n\n\"longlongsize\"\nFrom dlonglong.U:\n\nThis variable contains the value of the \"LONGLONGSIZE\" symbol, which indicates to the C\nprogram how many bytes there are in a long long, if this system supports long long.\n\n\"longsize\"\nFrom intsize.U:\n\nThis variable contains the value of the \"LONGSIZE\" symbol, which indicates to the C program\nhow many bytes there are in a long.\n\n\"lp\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"lpr\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"ls\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nls program. After Configure runs, the value is reset to a plain \"ls\" and is not useful.\n\n\"lseeksize\"\nFrom lseektype.U:\n\nThis variable defines lseektype to be something like offt, long, or whatever type is used\nto declare lseek offset's type in the kernel (which also appears to be lseek's return type).\n\n\"lseektype\"\nFrom lseektype.U:\n\nThis variable defines lseektype to be something like offt, long, or whatever type is used\nto declare lseek offset's type in the kernel (which also appears to be lseek's return type).\n\nm\n\"mail\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"mailx\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"make\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nmake program. After Configure runs, the value is reset to a plain \"make\" and is not useful.\n\n\"makesetmake\"\nFrom make.U:\n\nSome versions of \"make\" set the variable \"MAKE\". Others do not. This variable contains the\nstring to be included in Makefile.SH so that \"MAKE\" is set if needed, and not if not needed.\nPossible values are:\n\nmakesetmake=\"#\" # If your make program handles this for you,\n\nmakesetmake=\"MAKE=$make\" # if it doesn't.\n\nThis uses a comment character so that we can distinguish a \"set\" value (from a previous\nconfig.sh or Configure \"-D\" option) from an uncomputed value.\n\n\"mallocobj\"\nFrom mallocsrc.U:\n\nThis variable contains the name of the malloc.o that this package generates, if that\nmalloc.o is preferred over the system malloc. Otherwise the value is null. This variable is\nintended for generating Makefiles. See mallocsrc.\n\n\"mallocsrc\"\nFrom mallocsrc.U:\n\nThis variable contains the name of the malloc.c that comes with the package, if that\nmalloc.c is preferred over the system malloc. Otherwise the value is null. This variable is\nintended for generating Makefiles.\n\n\"malloctype\"\nFrom mallocsrc.U:\n\nThis variable contains the kind of ptr returned by malloc and realloc.\n\n\"man1dir\"\nFrom man1dir.U:\n\nThis variable contains the name of the directory in which manual source pages are to be put.\nIt is the responsibility of the Makefile.SH to get the value of this into the proper\ncommand. You must be prepared to do the ~name expansion yourself.\n\n\"man1direxp\"\nFrom man1dir.U:\n\nThis variable is the same as the man1dir variable, but is filename expanded at configuration\ntime, for convenient use in makefiles.\n\n\"man1ext\"\nFrom man1dir.U:\n\nThis variable contains the extension that the manual page should have: one of \"n\", \"l\", or\n1. The Makefile must supply the .. See man1dir.\n\n\"man3dir\"\nFrom man3dir.U:\n\nThis variable contains the name of the directory in which manual source pages are to be put.\nIt is the responsibility of the Makefile.SH to get the value of this into the proper\ncommand. You must be prepared to do the ~name expansion yourself.\n\n\"man3direxp\"\nFrom man3dir.U:\n\nThis variable is the same as the man3dir variable, but is filename expanded at configuration\ntime, for convenient use in makefiles.\n\n\"man3ext\"\nFrom man3dir.U:\n\nThis variable contains the extension that the manual page should have: one of \"n\", \"l\", or\n3. The Makefile must supply the .. See man3dir.\n\n\"mipstype\"\nFrom usrinc.U:\n\nThis variable holds the environment type for the mips system. Possible values are \"BSD 4.3\"\nand \"System V\".\n\n\"mistrustnm\"\nFrom Csym.U:\n\nThis variable can be used to establish a fallthrough for the cases where nm fails to find a\nsymbol. If usenm is false or usenm is true and mistrustnm is false, this variable has no\neffect. If usenm is true and mistrustnm is \"compile\", a test program will be compiled to try\nto find any symbol that can't be located via nm lookup. If mistrustnm is \"run\", the test\nprogram will be run as well as being compiled.\n\n\"mkdir\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nmkdir program. After Configure runs, the value is reset to a plain \"mkdir\" and is not\nuseful.\n\n\"mmaptype\"\nFrom dmmap.U:\n\nThis symbol contains the type of pointer returned by mmap() (and simultaneously the type of\nthe first argument). It can be \"void *\" or \"caddrt\".\n\n\"modetype\"\nFrom modetype.U:\n\nThis variable defines modetype to be something like modet, int, unsigned short, or whatever\ntype is used to declare file modes for system calls.\n\n\"more\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nmore program. After Configure runs, the value is reset to a plain \"more\" and is not useful.\n\n\"multiarch\"\nFrom multiarch.U:\n\nThis variable conditionally defines the \"MULTIARCH\" symbol which signifies the presence of\nmultiplatform files. This is normally set by hints files.\n\n\"mv\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"myarchname\"\nFrom archname.U:\n\nThis variable holds the architecture name computed by Configure in a previous run. It is not\nintended to be perused by any user and should never be set in a hint file.\n\n\"mydomain\"\nFrom myhostname.U:\n\nThis variable contains the eventual value of the \"MYDOMAIN\" symbol, which is the domain of\nthe host the program is going to run on. The domain must be appended to myhostname to form a\ncomplete host name. The dot comes with mydomain, and need not be supplied by the program.\n\n\"myhostname\"\nFrom myhostname.U:\n\nThis variable contains the eventual value of the \"MYHOSTNAME\" symbol, which is the name of\nthe host the program is going to run on. The domain is not kept with hostname, but must be\ngotten from mydomain. The dot comes with mydomain, and need not be supplied by the program.\n\n\"myuname\"\nFrom Oldconfig.U:\n\nThe output of \"uname -a\" if available, otherwise the hostname. The whole thing is then\nlower-cased and slashes and single quotes are removed.\n\nn\n\"n\" From n.U:\n\nThis variable contains the \"-n\" flag if that is what causes the echo command to suppress\nnewline. Otherwise it is null. Correct usage is $echo $n \"prompt for a question: $c\".\n\n\"needvacopy\"\nFrom needvacopy.U:\n\nThis symbol, if defined, indicates that the system stores the variable argument list\ndatatype, valist, in a format that cannot be copied by simple assignment, so that some\nother means must be used when copying is required. As such systems vary in their provision\n(or non-provision) of copying mechanisms, handy.h defines a platform- \"independent\" macro,\nPerlvacopy(src, dst), to do the job.\n\n\"netdbhlentype\"\nFrom netdbtype.U:\n\nThis variable holds the type used for the 2nd argument to gethostbyaddr(). Usually, this is\nint or sizet or unsigned. This is only useful if you have gethostbyaddr(), naturally.\n\n\"netdbhosttype\"\nFrom netdbtype.U:\n\nThis variable holds the type used for the 1st argument to gethostbyaddr(). Usually, this is\nchar * or void *, possibly with or without a const prefix. This is only useful if you have\ngethostbyaddr(), naturally.\n\n\"netdbnametype\"\nFrom netdbtype.U:\n\nThis variable holds the type used for the argument to gethostbyname(). Usually, this is char\n* or const char *. This is only useful if you have gethostbyname(), naturally.\n\n\"netdbnettype\"\nFrom netdbtype.U:\n\nThis variable holds the type used for the 1st argument to getnetbyaddr(). Usually, this is\nint or long. This is only useful if you have getnetbyaddr(), naturally.\n\n\"nm\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nnm program. After Configure runs, the value is reset to a plain \"nm\" and is not useful.\n\n\"nmopt\"\nFrom usenm.U:\n\nThis variable holds the options that may be necessary for nm.\n\n\"nmsoopt\"\nFrom usenm.U:\n\nThis variable holds the options that may be necessary for nm to work on a shared library but\nthat can not be used on an archive library. Currently, this is only used by Linux, where nm\n--dynamic is *required* to get symbols from an \"ELF\" library which has been stripped, but nm\n--dynamic is *fatal* on an archive library. Maybe Linux should just always set usenm=false.\n\n\"nonxsext\"\nFrom Extensions.U:\n\nThis variable holds a list of all non-xs extensions built and installed by the package. By\ndefault, all non-xs extensions distributed will be built, with the exception of\nplatform-specific extensions (currently only one \"VMS\" specific extension).\n\n\"nroff\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nnroff program. After Configure runs, the value is reset to a plain \"nroff\" and is not\nuseful.\n\n\"nvoverflowsintegersat\"\nFrom perlxv.U:\n\nThis variable gives the largest integer value that NVs can hold as a constant floating point\nexpression. If it could not be determined, it holds the value 0.\n\n\"nvpreservesuvbits\"\nFrom perlxv.U:\n\nThis variable indicates how many of bits type uvtype a variable nvtype can preserve.\n\n\"nveformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"NV\" using %e-ish floating\npoint format.\n\n\"nvEUformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"NV\" using %E-ish floating\npoint format.\n\n\"nvfformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"NV\" using %f-ish floating\npoint format.\n\n\"nvFUformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"NV\" using %F-ish floating\npoint format.\n\n\"nvgformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"NV\" using %g-ish floating\npoint format.\n\n\"nvGUformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"NV\" using %G-ish floating\npoint format.\n\n\"nvmantbits\"\nFrom mantbits.U:\n\nThis variable tells how many bits the mantissa of a Perl \"NV\" has, not including the\npossible implicit bit.\n\n\"nvsize\"\nFrom perlxv.U:\n\nThis variable is the size of a Perl \"NV\" in bytes. Note that some floating point formats\nhave unused bytes.\n\n\"nvtype\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's \"NV\".\n\no\n\"ononblock\"\nFrom nblockio.U:\n\nThis variable bears the symbol value to be used during open() or fcntl() to turn on\nnon-blocking I/O for a file descriptor. If you wish to switch between blocking and\nnon-blocking, you may try ioctl(\"FIOSNBIO\") instead, but that is only supported by some\ndevices.\n\n\"objext\"\nFrom Unix.U:\n\nThis is an old synonym for o.\n\n\"oldpthreadcreatejoinable\"\nFrom dpthrattrj.U:\n\nThis variable defines the constant to use for creating joinable (aka undetached) pthreads.\nUnused if pthread.h defines \"PTHREADCREATEJOINABLE\". If used, possible values are\n\"PTHREADCREATEUNDETACHED\" and \"UNDETACHED\".\n\n\"optimize\"\nFrom ccflags.U:\n\nThis variable contains any optimizer/debugger flag that should be used. It is up to the\nMakefile to use it.\n\n\"orderlib\"\nFrom orderlib.U:\n\nThis variable is \"true\" if the components of libraries must be ordered (with `lorder $* |\ntsort`) before placing them in an archive. Set to \"false\" if ranlib or ar can generate\nrandom libraries.\n\n\"osname\"\nFrom Oldconfig.U:\n\nThis variable contains the operating system name (e.g. sunos, solaris, hpux, etc.). It can\nbe useful later on for setting defaults. Any spaces are replaced with underscores. It is set\nto a null string if we can't figure it out.\n\n\"osvers\"\nFrom Oldconfig.U:\n\nThis variable contains the operating system version (e.g. 4.1.3, 5.2, etc.). It is primarily\nused for helping select an appropriate hints file, but might be useful elsewhere for setting\ndefaults. It is set to '' if we can't figure it out. We try to be flexible about how much of\nthe version number to keep, e.g. if 4.1.1, 4.1.2, and 4.1.3 are essentially the same for\nthis package, hints files might just be os4.0 or os4.1, etc., not keeping separate files\nfor each little release.\n\n\"otherlibdirs\"\nFrom otherlibdirs.U:\n\nThis variable contains a colon-separated set of paths for the perl binary to search for\nadditional library files or modules. These directories will be tacked to the end of @\"INC\".\nPerl will automatically search below each path for version- and architecture-specific\ndirectories. See incversionlist for more details. A value of \" \" means \"none\" and is used\nto preserve this value for the next run through Configure.\n\np\n\"package\"\nFrom package.U:\n\nThis variable contains the name of the package being constructed. It is primarily intended\nfor the use of later Configure units.\n\n\"pager\"\nFrom pager.U:\n\nThis variable contains the name of the preferred pager on the system. Usual values are (the\nfull pathnames of) more, less, pg, or cat.\n\n\"passcat\"\nFrom nis.U:\n\nThis variable contains a command that produces the text of the /etc/passwd file. This is\nnormally \"cat /etc/passwd\", but can be \"ypcat passwd\" when \"NIS\" is used. On some systems,\nsuch as os390, there may be no equivalent command, in which case this variable is unset.\n\n\"patchlevel\"\nFrom patchlevel.U:\n\nThe patchlevel level of this package. The value of patchlevel comes from the patchlevel.h\nfile. In a version number such as 5.6.1, this is the 6. In patchlevel.h, this is referred to\nas \"PERLVERSION\".\n\n\"pathsep\"\nFrom Unix.U:\n\nThis is an old synonym for p in Head.U, the character used to separate elements in the\ncommand shell search \"PATH\".\n\n\"perl\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nperl program. After Configure runs, the value is reset to a plain \"perl\" and is not useful.\n\n\"perl5\"\nFrom perl5.U:\n\nThis variable contains the full path (if any) to a previously installed perl5.005 or later\nsuitable for running the script to determine incversionlist.\n\nP\n\"PERLAPIREVISION\"\nFrom patchlevel.h:\n\nThis number describes the earliest compatible \"PERLREVISION\" of Perl (\"compatibility\" here\nbeing defined as sufficient binary/\"API\" compatibility to run \"XS\" code built with the older\nversion). Normally this does not change across maintenance releases. Please read the comment\nin patchlevel.h.\n\n\"PERLAPISUBVERSION\"\nFrom patchlevel.h:\n\nThis number describes the earliest compatible \"PERLSUBVERSION\" of Perl (\"compatibility\"\nhere being defined as sufficient binary/\"API\" compatibility to run \"XS\" code built with the\nolder version). Normally this does not change across maintenance releases. Please read the\ncomment in patchlevel.h.\n\n\"PERLAPIVERSION\"\nFrom patchlevel.h:\n\nThis number describes the earliest compatible \"PERLVERSION\" of Perl (\"compatibility\" here\nbeing defined as sufficient binary/\"API\" compatibility to run \"XS\" code built with the older\nversion). Normally this does not change across maintenance releases. Please read the comment\nin patchlevel.h.\n\n\"PERLCONFIGSH\"\nFrom Oldsyms.U:\n\nThis is set to \"true\" in config.sh so that a shell script sourcing config.sh can tell if it\nhas been sourced already.\n\n\"PERLPATCHLEVEL\"\nFrom Oldsyms.U:\n\nThis symbol reflects the patchlevel, if available. Will usually come from the .patch file,\nwhich is available when the perl source tree was fetched with rsync.\n\n\"perlpatchlevel\"\nFrom patchlevel.U:\n\nThis is the Perl patch level, a numeric change identifier, as defined by whichever source\ncode maintenance system is used to maintain the patches; currently Perforce. It does not\ncorrelate with the Perl version numbers or the maintenance versus development dichotomy\nexcept by also being increasing.\n\n\"PERLREVISION\"\nFrom Oldsyms.U:\n\nIn a Perl version number such as 5.6.2, this is the 5. This value is manually set in\npatchlevel.h\n\n\"perlstaticinline\"\nFrom dstaticinline.U:\n\nThis variable defines the \"PERLSTATICINLINE\" symbol to the best-guess incantation to use\nfor static inline functions. Possibilities include static inline (c99) static inline\n(gcc -ansi) static inline (\"MSVC\") static inline (older \"MSVC\") static (c89 compilers)\n\n\"PERLSUBVERSION\"\nFrom Oldsyms.U:\n\nIn a Perl version number such as 5.6.2, this is the 2. Values greater than 50 represent\npotentially unstable development subversions. This value is manually set in patchlevel.h\n\n\"PERLVERSION\"\nFrom Oldsyms.U:\n\nIn a Perl version number such as 5.6.2, this is the 6. This value is manually set in\npatchlevel.h\n\n\"perladmin\"\nFrom perladmin.U:\n\nElectronic mail address of the perl5 administrator.\n\n\"perllibs\"\nFrom End.U:\n\nThe list of libraries needed by Perl only (any libraries needed by extensions only will by\ndropped, if using dynamic loading).\n\n\"perlpath\"\nFrom perlpath.U:\n\nThis variable contains the eventual value of the \"PERLPATH\" symbol, which contains the name\nof the perl interpreter to be used in shell scripts and in the \"eval \"exec\"\" idiom. This\nvariable is not necessarily the pathname of the file containing the perl interpreter; you\nmust append the executable extension (exe) if it is not already present. Note that Perl\ncode that runs during the Perl build process cannot reference this variable, as Perl may not\nhave been installed, or even if installed, may be a different version of Perl.\n\n\"pg\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\npg program. After Configure runs, the value is reset to a plain \"pg\" and is not useful.\n\n\"phostname\"\nFrom myhostname.U:\n\nThis variable contains the eventual value of the \"PHOSTNAME\" symbol, which is a command that\ncan be fed to popen() to get the host name. The program should probably not presume that the\ndomain is or isn't there already.\n\n\"pidtype\"\nFrom pidtype.U:\n\nThis variable defines \"PIDTYPE\" to be something like pidt, int, ushort, or whatever type is\nused to declare process ids in the kernel.\n\n\"plibpth\"\nFrom libpth.U:\n\nHolds the private path used by Configure to find out the libraries. Its value is prepend to\nlibpth. This variable takes care of special machines, like the mips. Usually, it should be\nempty.\n\n\"pmake\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"pr\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"prefix\"\nFrom prefix.U:\n\nThis variable holds the name of the directory below which the user will install the package.\nUsually, this is /usr/local, and executables go in /usr/local/bin, library stuff in\n/usr/local/lib, man pages in /usr/local/man, etc. It is only used to set defaults for things\nin bin.U, mansrc.U, privlib.U, or scriptdir.U.\n\n\"prefixexp\"\nFrom prefix.U:\n\nThis variable holds the full absolute path of the directory below which the user will\ninstall the package. Derived from prefix.\n\n\"privlib\"\nFrom privlib.U:\n\nThis variable contains the eventual value of the \"PRIVLIB\" symbol, which is the name of the\nprivate library for this package. It may have a ~ on the front. It is up to the makefile to\neventually create this directory while performing installation (with ~ substitution).\n\n\"privlibexp\"\nFrom privlib.U:\n\nThis variable is the ~name expanded version of privlib, so that you may use it directly in\nMakefiles or shell scripts.\n\n\"procselfexe\"\nFrom dprocselfexe.U:\n\nIf dprocselfexe is defined, $procselfexe is the filename of the symbolic link pointing to\nthe absolute pathname of the executing program.\n\n\"ptrsize\"\nFrom ptrsize.U:\n\nThis variable contains the value of the \"PTRSIZE\" symbol, which indicates to the C program\nhow many bytes there are in a pointer.\n\nq\n\"quadkind\"\nFrom quadtype.U:\n\nThis variable, if defined, encodes the type of a quad: 1 = int, 2 = long, 3 = long long, 4 =\nint64t.\n\n\"quadtype\"\nFrom quadtype.U:\n\nThis variable defines Quadt to be something like long, int, long long, int64t, or whatever\ntype is used for 64-bit integers.\n\nr\n\"randbits\"\nFrom randfunc.U:\n\nIndicates how many bits are produced by the function used to generate normalized random\nnumbers.\n\n\"randfunc\"\nFrom randfunc.U:\n\nIndicates the name of the random number function to use. Values include drand48, random, and\nrand. In C programs, the \"Drand01\" macro is defined to generate uniformly distributed random\nnumbers over the range [0., 1.[ (see drand01 and nrand).\n\n\"randomrproto\"\nFrom drandomr.U:\n\nThis variable encodes the prototype of randomr. It is zero if drandomr is undef, and one\nof the \"REENTRANTPROTOTABC\" macros of reentr.h if drandomr is defined.\n\n\"randseedtype\"\nFrom randfunc.U:\n\nIndicates the type of the argument of the seedfunc.\n\n\"ranlib\"\nFrom orderlib.U:\n\nThis variable is set to the pathname of the ranlib program, if it is needed to generate\nrandom libraries. Set to \":\" if ar can generate random libraries or if random libraries are\nnot supported\n\n\"rdnodata\"\nFrom nblockio.U:\n\nThis variable holds the return code from read() when no data is present. It should be -1,\nbut some systems return 0 when \"ONDELAY\" is used, which is a shame because you cannot make\nthe difference between no data and an EOF.. Sigh!\n\n\"readdir64rproto\"\nFrom dreaddir64r.U:\n\nThis variable encodes the prototype of readdir64r. It is zero if dreaddir64r is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dreaddir64r is defined.\n\n\"readdirrproto\"\nFrom dreaddirr.U:\n\nThis variable encodes the prototype of readdirr. It is zero if dreaddirr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dreaddirr is defined.\n\n\"revision\"\nFrom patchlevel.U:\n\nThe value of revision comes from the patchlevel.h file. In a version number such as 5.6.1,\nthis is the 5. In patchlevel.h, this is referred to as \"PERLREVISION\".\n\n\"rm\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nrm program. After Configure runs, the value is reset to a plain \"rm\" and is not useful.\n\n\"rmtry\"\nFrom Unix.U:\n\nThis is a cleanup variable for try test programs. Internal Configure use only.\n\n\"rmail\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"run\"\nFrom Cross.U:\n\nThis variable contains the command used by Configure to copy and execute a cross-compiled\nexecutable in the target host. Useful and available only during Perl build. Empty string ''\nif not cross-compiling.\n\n\"runnm\"\nFrom usenm.U:\n\nThis variable contains \"true\" or \"false\" depending whether the nm extraction should be\nperformed or not, according to the value of usenm and the flags on the Configure command\nline.\n\ns\n\"schedyield\"\nFrom dpthready.U:\n\nThis variable defines the way to yield the execution of the current thread.\n\n\"scriptdir\"\nFrom scriptdir.U:\n\nThis variable holds the name of the directory in which the user wants to put publicly\nscripts for the package in question. It is either the same directory as for binaries, or a\nspecial one that can be mounted across different architectures, like /usr/share. Programs\nmust be prepared to deal with ~name expansion.\n\n\"scriptdirexp\"\nFrom scriptdir.U:\n\nThis variable is the same as scriptdir, but is filename expanded at configuration time, for\nprograms not wanting to bother with it.\n\n\"sed\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nsed program. After Configure runs, the value is reset to a plain \"sed\" and is not useful.\n\n\"seedfunc\"\nFrom randfunc.U:\n\nIndicates the random number generating seed function. Values include srand48, srandom, and\nsrand.\n\n\"selectminbits\"\nFrom selectminbits.U:\n\nThis variable holds the minimum number of bits operated by select. That is, if you do\nselect(n, ...), how many bits at least will be cleared in the masks if some activity is\ndetected. Usually this is either n or 32*ceil(n/32), especially many little-endians do the\nlatter. This is only useful if you have select(), naturally.\n\n\"selecttype\"\nFrom selecttype.U:\n\nThis variable holds the type used for the 2nd, 3rd, and 4th arguments to select. Usually,\nthis is \"fdset *\", if \"HASFDSET\" is defined, and \"int *\" otherwise. This is only useful\nif you have select(), naturally.\n\n\"sendmail\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"setgrentrproto\"\nFrom dsetgrentr.U:\n\nThis variable encodes the prototype of setgrentr. It is zero if dsetgrentr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dsetgrentr is defined.\n\n\"sethostentrproto\"\nFrom dsethostentr.U:\n\nThis variable encodes the prototype of sethostentr. It is zero if dsethostentr is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dsethostentr is defined.\n\n\"setlocalerproto\"\nFrom dsetlocaler.U:\n\nThis variable encodes the prototype of setlocaler. It is zero if dsetlocaler is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dsetlocaler is defined.\n\n\"setnetentrproto\"\nFrom dsetnetentr.U:\n\nThis variable encodes the prototype of setnetentr. It is zero if dsetnetentr is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dsetnetentr is defined.\n\n\"setprotoentrproto\"\nFrom dsetprotoentr.U:\n\nThis variable encodes the prototype of setprotoentr. It is zero if dsetprotoentr is\nundef, and one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dsetprotoentr is\ndefined.\n\n\"setpwentrproto\"\nFrom dsetpwentr.U:\n\nThis variable encodes the prototype of setpwentr. It is zero if dsetpwentr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dsetpwentr is defined.\n\n\"setserventrproto\"\nFrom dsetserventr.U:\n\nThis variable encodes the prototype of setserventr. It is zero if dsetserventr is undef,\nand one of the \"REENTRANTPROTOTABC\" macros of reentr.h if dsetserventr is defined.\n\n\"sGMTIMEmax\"\nFrom timesize.U:\n\nThis variable defines the maximum value of the timet offset that the system function gmtime\n() accepts\n\n\"sGMTIMEmin\"\nFrom timesize.U:\n\nThis variable defines the minimum value of the timet offset that the system function gmtime\n() accepts\n\n\"sh\"\nFrom sh.U:\n\nThis variable contains the full pathname of the shell used on this system to execute Bourne\nshell scripts. Usually, this will be /bin/sh, though it's possible that some systems will\nhave /bin/ksh, /bin/pdksh, /bin/ash, /bin/bash, or even something such as D:/bin/sh.exe.\nThis unit comes before Options.U, so you can't set sh with a \"-D\" option, though you can\noverride this (and startsh) with \"-O -Dsh=/bin/whatever -Dstartsh=whatever\"\n\n\"shar\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"sharpbang\"\nFrom spitshell.U:\n\nThis variable contains the string #! if this system supports that construct.\n\n\"shmattype\"\nFrom dshmat.U:\n\nThis symbol contains the type of pointer returned by shmat(). It can be \"void *\" or \"char\n*\".\n\n\"shortsize\"\nFrom intsize.U:\n\nThis variable contains the value of the \"SHORTSIZE\" symbol which indicates to the C program\nhow many bytes there are in a short.\n\n\"shrpenv\"\nFrom libperl.U:\n\nIf the user builds a shared libperl.so, then we need to tell the \"perl\" executable where it\nwill be able to find the installed libperl.so. One way to do this on some systems is to set\nthe environment variable \"LDRUNPATH\" to the directory that will be the final location of\nthe shared libperl.so. The makefile can use this with something like $shrpenv $(\"CC\") -o\nperl perlmain.o $libperl $libs Typical values are shrpenv=\"env\n\"LDRUNPATH\"=$archlibexp/\"CORE\"\" or shrpenv='' See the main perl Makefile.SH for actual\nworking usage.\n\nAlternatively, we might be able to use a command line option such as -R $archlibexp/\"CORE\"\n(Solaris) or -Wl,-rpath $archlibexp/\"CORE\" (Linux).\n\n\"shsharp\"\nFrom spitshell.U:\n\nThis variable tells further Configure units whether your sh can handle # comments.\n\n\"sigcount\"\nFrom signame.U:\n\nThis variable holds a number larger than the largest valid signal number. This is usually\nthe same as the \"NSIG\" macro.\n\n\"signame\"\nFrom signame.U:\n\nThis variable holds the signal names, space separated. The leading \"SIG\" in signal name is\nremoved. A \"ZERO\" is prepended to the list. This is currently not used, signameinit is\nused instead.\n\n\"signameinit\"\nFrom signame.U:\n\nThis variable holds the signal names, enclosed in double quotes and separated by commas,\nsuitable for use in the \"SIGNAME\" definition below. A \"ZERO\" is prepended to the list, and\nthe list is terminated with a plain 0. The leading \"SIG\" in signal names is removed. See\nsignum.\n\n\"signum\"\nFrom signame.U:\n\nThis variable holds the signal numbers, space separated. A \"ZERO\" is prepended to the list\n(corresponding to the fake \"SIGZERO\"). Those numbers correspond to the value of the signal\nlisted in the same place within the signame list. This is currently not used, signuminit\nis used instead.\n\n\"signuminit\"\nFrom signame.U:\n\nThis variable holds the signal numbers, enclosed in double quotes and separated by commas,\nsuitable for use in the \"SIGNUM\" definition below. A \"ZERO\" is prepended to the list, and\nthe list is terminated with a plain 0.\n\n\"sigsize\"\nFrom signame.U:\n\nThis variable contains the number of elements of the signame and signum arrays.\n\n\"signalt\"\nFrom dvoidsig.U:\n\nThis variable holds the type of the signal handler (void or int).\n\n\"sitearch\"\nFrom sitearch.U:\n\nThis variable contains the eventual value of the \"SITEARCH\" symbol, which is the name of the\nprivate library for this package. It may have a ~ on the front. It is up to the makefile to\neventually create this directory while performing installation (with ~ substitution). The\nstandard distribution will put nothing in this directory. After perl has been installed,\nusers may install their own local architecture-dependent modules in this directory with\nMakeMaker Makefile.PL or equivalent. See \"INSTALL\" for details.\n\n\"sitearchexp\"\nFrom sitearch.U:\n\nThis variable is the ~name expanded version of sitearch, so that you may use it directly in\nMakefiles or shell scripts.\n\n\"sitebin\"\nFrom sitebin.U:\n\nThis variable holds the name of the directory in which the user wants to put add-on publicly\nexecutable files for the package in question. It is most often a local directory such as\n/usr/local/bin. Programs using this variable must be prepared to deal with ~name\nsubstitution. The standard distribution will put nothing in this directory. After perl has\nbeen installed, users may install their own local executables in this directory with\nMakeMaker Makefile.PL or equivalent. See \"INSTALL\" for details.\n\n\"sitebinexp\"\nFrom sitebin.U:\n\nThis is the same as the sitebin variable, but is filename expanded at configuration time,\nfor use in your makefiles.\n\n\"sitehtml1dir\"\nFrom sitehtml1dir.U:\n\nThis variable contains the name of the directory in which site-specific html source pages\nare to be put. It is the responsibility of the Makefile.SH to get the value of this into the\nproper command. You must be prepared to do the ~name expansion yourself. The standard\ndistribution will put nothing in this directory. After perl has been installed, users may\ninstall their own local html pages in this directory with MakeMaker Makefile.PL or\nequivalent. See \"INSTALL\" for details.\n\n\"sitehtml1direxp\"\nFrom sitehtml1dir.U:\n\nThis variable is the same as the sitehtml1dir variable, but is filename expanded at\nconfiguration time, for convenient use in makefiles.\n\n\"sitehtml3dir\"\nFrom sitehtml3dir.U:\n\nThis variable contains the name of the directory in which site-specific library html source\npages are to be put. It is the responsibility of the Makefile.SH to get the value of this\ninto the proper command. You must be prepared to do the ~name expansion yourself. The\nstandard distribution will put nothing in this directory. After perl has been installed,\nusers may install their own local library html pages in this directory with MakeMaker\nMakefile.PL or equivalent. See \"INSTALL\" for details.\n\n\"sitehtml3direxp\"\nFrom sitehtml3dir.U:\n\nThis variable is the same as the sitehtml3dir variable, but is filename expanded at\nconfiguration time, for convenient use in makefiles.\n\n\"sitelib\"\nFrom sitelib.U:\n\nThis variable contains the eventual value of the \"SITELIB\" symbol, which is the name of the\nprivate library for this package. It may have a ~ on the front. It is up to the makefile to\neventually create this directory while performing installation (with ~ substitution). The\nstandard distribution will put nothing in this directory. After perl has been installed,\nusers may install their own local architecture-independent modules in this directory with\nMakeMaker Makefile.PL or equivalent. See \"INSTALL\" for details.\n\n\"sitelibstem\"\nFrom sitelib.U:\n\nThis variable is $sitelibexp with any trailing version-specific component removed. The\nelements in incversionlist (incversionlist.U) can be tacked onto this variable to\ngenerate a list of directories to search.\n\n\"sitelibexp\"\nFrom sitelib.U:\n\nThis variable is the ~name expanded version of sitelib, so that you may use it directly in\nMakefiles or shell scripts.\n\n\"siteman1dir\"\nFrom siteman1dir.U:\n\nThis variable contains the name of the directory in which site-specific manual source pages\nare to be put. It is the responsibility of the Makefile.SH to get the value of this into the\nproper command. You must be prepared to do the ~name expansion yourself. The standard\ndistribution will put nothing in this directory. After perl has been installed, users may\ninstall their own local man1 pages in this directory with MakeMaker Makefile.PL or\nequivalent. See \"INSTALL\" for details.\n\n\"siteman1direxp\"\nFrom siteman1dir.U:\n\nThis variable is the same as the siteman1dir variable, but is filename expanded at\nconfiguration time, for convenient use in makefiles.\n\n\"siteman3dir\"\nFrom siteman3dir.U:\n\nThis variable contains the name of the directory in which site-specific library man source\npages are to be put. It is the responsibility of the Makefile.SH to get the value of this\ninto the proper command. You must be prepared to do the ~name expansion yourself. The\nstandard distribution will put nothing in this directory. After perl has been installed,\nusers may install their own local man3 pages in this directory with MakeMaker Makefile.PL or\nequivalent. See \"INSTALL\" for details.\n\n\"siteman3direxp\"\nFrom siteman3dir.U:\n\nThis variable is the same as the siteman3dir variable, but is filename expanded at\nconfiguration time, for convenient use in makefiles.\n\n\"siteprefix\"\nFrom siteprefix.U:\n\nThis variable holds the full absolute path of the directory below which the user will\ninstall add-on packages. See \"INSTALL\" for usage and examples.\n\n\"siteprefixexp\"\nFrom siteprefix.U:\n\nThis variable holds the full absolute path of the directory below which the user will\ninstall add-on packages. Derived from siteprefix.\n\n\"sitescript\"\nFrom sitescript.U:\n\nThis variable holds the name of the directory in which the user wants to put add-on publicly\nexecutable files for the package in question. It is most often a local directory such as\n/usr/local/bin. Programs using this variable must be prepared to deal with ~name\nsubstitution. The standard distribution will put nothing in this directory. After perl has\nbeen installed, users may install their own local scripts in this directory with MakeMaker\nMakefile.PL or equivalent. See \"INSTALL\" for details.\n\n\"sitescriptexp\"\nFrom sitescript.U:\n\nThis is the same as the sitescript variable, but is filename expanded at configuration time,\nfor use in your makefiles.\n\n\"sizesize\"\nFrom sizesize.U:\n\nThis variable contains the size of a sizetype in bytes.\n\n\"sizetype\"\nFrom sizetype.U:\n\nThis variable defines sizetype to be something like sizet, unsigned long, or whatever type\nis used to declare length parameters for string functions.\n\n\"sleep\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"sLOCALTIMEmax\"\nFrom timesize.U:\n\nThis variable defines the maximum value of the timet offset that the system function\nlocaltime () accepts\n\n\"sLOCALTIMEmin\"\nFrom timesize.U:\n\nThis variable defines the minimum value of the timet offset that the system function\nlocaltime () accepts\n\n\"smail\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"so\"\nFrom so.U:\n\nThis variable holds the extension used to identify shared libraries (also known as shared\nobjects) on the system. Usually set to \"so\".\n\n\"sockethdr\"\nFrom dsocket.U:\n\nThis variable has any cpp \"-I\" flags needed for socket support.\n\n\"socketlib\"\nFrom dsocket.U:\n\nThis variable has the names of any libraries needed for socket support.\n\n\"socksizetype\"\nFrom socksizetype.U:\n\nThis variable holds the type used for the size argument for various socket calls like\naccept. Usual values include socklent, sizet, and int.\n\n\"sort\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nsort program. After Configure runs, the value is reset to a plain \"sort\" and is not useful.\n\n\"spackage\"\nFrom package.U:\n\nThis variable contains the name of the package being constructed, with the first letter\nuppercased, i.e. suitable for starting sentences.\n\n\"spitshell\"\nFrom spitshell.U:\n\nThis variable contains the command necessary to spit out a runnable shell on this system. It\nis either cat or a grep \"-v\" for # comments.\n\n\"sPRId64\"\nFrom quadfio.U:\n\nThis variable, if defined, contains the string used by stdio to format 64-bit decimal\nnumbers (format \"d\") for output.\n\n\"sPRIeldbl\"\nFrom longdblfio.U:\n\nThis variable, if defined, contains the string used by stdio to format long doubles (format\n\"e\") for output.\n\n\"sPRIEUldbl\"\nFrom longdblfio.U:\n\nThis variable, if defined, contains the string used by stdio to format long doubles (format\n\"E\") for output. The \"U\" in the name is to separate this from sPRIeldbl so that even\ncase-blind systems can see the difference.\n\n\"sPRIfldbl\"\nFrom longdblfio.U:\n\nThis variable, if defined, contains the string used by stdio to format long doubles (format\n\"f\") for output.\n\n\"sPRIFUldbl\"\nFrom longdblfio.U:\n\nThis variable, if defined, contains the string used by stdio to format long doubles (format\n\"F\") for output. The \"U\" in the name is to separate this from sPRIfldbl so that even\ncase-blind systems can see the difference.\n\n\"sPRIgldbl\"\nFrom longdblfio.U:\n\nThis variable, if defined, contains the string used by stdio to format long doubles (format\n\"g\") for output.\n\n\"sPRIGUldbl\"\nFrom longdblfio.U:\n\nThis variable, if defined, contains the string used by stdio to format long doubles (format\n\"G\") for output. The \"U\" in the name is to separate this from sPRIgldbl so that even\ncase-blind systems can see the difference.\n\n\"sPRIi64\"\nFrom quadfio.U:\n\nThis variable, if defined, contains the string used by stdio to format 64-bit decimal\nnumbers (format \"i\") for output.\n\n\"sPRIo64\"\nFrom quadfio.U:\n\nThis variable, if defined, contains the string used by stdio to format 64-bit octal numbers\n(format \"o\") for output.\n\n\"sPRIu64\"\nFrom quadfio.U:\n\nThis variable, if defined, contains the string used by stdio to format 64-bit unsigned\ndecimal numbers (format \"u\") for output.\n\n\"sPRIx64\"\nFrom quadfio.U:\n\nThis variable, if defined, contains the string used by stdio to format 64-bit hexadecimal\nnumbers (format \"x\") for output.\n\n\"sPRIXU64\"\nFrom quadfio.U:\n\nThis variable, if defined, contains the string used by stdio to format 64-bit hExADECimAl\nnumbers (format \"X\") for output. The \"U\" in the name is to separate this from sPRIx64 so\nthat even case-blind systems can see the difference.\n\n\"srand48rproto\"\nFrom dsrand48r.U:\n\nThis variable encodes the prototype of srand48r. It is zero if dsrand48r is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dsrand48r is defined.\n\n\"srandomrproto\"\nFrom dsrandomr.U:\n\nThis variable encodes the prototype of srandomr. It is zero if dsrandomr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dsrandomr is defined.\n\n\"src\"\nFrom src.U:\n\nThis variable holds the (possibly relative) path of the package source. It is up to the\nMakefile to use this variable and set \"VPATH\" accordingly to find the sources remotely. Use\n$pkgsrc to have an absolute path.\n\n\"sSCNfldbl\"\nFrom longdblfio.U:\n\nThis variable, if defined, contains the string used by stdio to format long doubles (format\n\"f\") for input.\n\n\"ssizetype\"\nFrom ssizetype.U:\n\nThis variable defines ssizetype to be something like ssizet, long or int. It is used by\nfunctions that return a count of bytes or an error condition. It must be a signed type. We\nwill pick a type such that sizeof(SSizet) == sizeof(Sizet).\n\n\"stinosign\"\nFrom stinodef.U:\n\nThis variable contains the signedness of struct stat's stino. 1 for unsigned, -1 for\nsigned.\n\n\"stinosize\"\nFrom stinodef.U:\n\nThis variable contains the size of struct stat's stino in bytes.\n\n\"startperl\"\nFrom startperl.U:\n\nThis variable contains the string to put on the front of a perl script to make sure\n(hopefully) that it runs with perl and not some shell. Of course, that leading line must be\nfollowed by the classical perl idiom: eval 'exec perl -S $0 ${1+$@}' if\n$runningundersomeshell; to guarantee perl startup should the shell execute the script.\nNote that this magic incantation is not understood by csh.\n\n\"startsh\"\nFrom startsh.U:\n\nThis variable contains the string to put on the front of a shell script to make sure\n(hopefully) that it runs with sh and not some other shell.\n\n\"staticext\"\nFrom Extensions.U:\n\nThis variable holds a list of \"XS\" extension files we want to link statically into the\npackage. It is used by Makefile.\n\n\"stdchar\"\nFrom stdchar.U:\n\nThis variable conditionally defines \"STDCHAR\" to be the type of char used in stdio.h. It has\nthe values \"unsigned char\" or \"char\".\n\n\"stdiobase\"\nFrom dstdstdio.U:\n\nThis variable defines how, given a \"FILE\" pointer, fp, to access the base field (or\nequivalent) of stdio.h's \"FILE\" structure. This will be used to define the macro\nFILEbase(fp).\n\n\"stdiobufsiz\"\nFrom dstdstdio.U:\n\nThis variable defines how, given a \"FILE\" pointer, fp, to determine the number of bytes\nstore in the I/O buffer pointer to by the base field (or equivalent) of stdio.h's \"FILE\"\nstructure. This will be used to define the macro FILEbufsiz(fp).\n\n\"stdiocnt\"\nFrom dstdstdio.U:\n\nThis variable defines how, given a \"FILE\" pointer, fp, to access the cnt field (or\nequivalent) of stdio.h's \"FILE\" structure. This will be used to define the macro\nFILEcnt(fp).\n\n\"stdiofilbuf\"\nFrom dstdstdio.U:\n\nThis variable defines how, given a \"FILE\" pointer, fp, to tell stdio to refill its internal\nbuffers (?). This will be used to define the macro FILEfilbuf(fp).\n\n\"stdioptr\"\nFrom dstdstdio.U:\n\nThis variable defines how, given a \"FILE\" pointer, fp, to access the ptr field (or\nequivalent) of stdio.h's \"FILE\" structure. This will be used to define the macro\nFILEptr(fp).\n\n\"stdiostreamarray\"\nFrom stdiostreams.U:\n\nThis variable tells the name of the array holding the stdio streams. Usual values include\niob, iob, and sF.\n\n\"strerrorrproto\"\nFrom dstrerrorr.U:\n\nThis variable encodes the prototype of strerrorr. It is zero if dstrerrorr is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dstrerrorr is defined.\n\n\"submit\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"subversion\"\nFrom patchlevel.U:\n\nThe subversion level of this package. The value of subversion comes from the patchlevel.h\nfile. In a version number such as 5.6.1, this is the 1. In patchlevel.h, this is referred to\nas \"PERLSUBVERSION\". This is unique to perl.\n\n\"sysman\"\nFrom sysman.U:\n\nThis variable holds the place where the manual is located on this system. It is not the\nplace where the user wants to put his manual pages. Rather it is the place where Configure\nmay look to find manual for unix commands (section 1 of the manual usually). See mansrc.\n\n\"sysroot\"\nFrom Sysroot.U:\n\nThis variable is empty unless supplied by the Configure user. It can contain a path to an\nalternative root directory, under which headers and libraries for the compilation target can\nbe found. This is generally used when cross-compiling using a gcc-like compiler.\n\nt\n\"tail\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"tar\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"targetarch\"\nFrom Cross.U:\n\nIf cross-compiling, this variable contains the target architecture. If not, this will be\nempty.\n\n\"targetdir\"\nFrom Cross.U:\n\nThis variable contains a path that will be created on the target host using targetmkdir, and\nthen used to copy the cross-compiled executables to. Defaults to /tmp if not set.\n\n\"targetenv\"\nFrom Cross.U:\n\nIf cross-compiling, this variable can be used to modify the environment on the target\nsystem. However, how and where it's used, and even if it's used at all, is entirely\ndependent on both the transport mechanism (targetrun) and what the target system is. Unless\nthe relevant documentation says otherwise, it is genereally not useful.\n\n\"targethost\"\nFrom Cross.U:\n\nThis variable contains the name of a separate host machine that can be used to run compiled\ntest programs and perl tests on. Set to empty string if not in use.\n\n\"targetmkdir\"\nFrom Cross.U:\n\nThis variable contains the command used by Configure to create a new directory on the target\nhost.\n\n\"targetport\"\nFrom Cross.U:\n\nThis variable contains the number of a network port to be used to connect to the host in\ntargethost, if unset defaults to 22 for ssh.\n\n\"targetsh\"\nFrom sh.U:\n\nIf cross-compiling, this variable contains the location of sh on the target system. If not,\nthis will be the same as $sh.\n\n\"tbl\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"tee\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"test\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ntest program. After Configure runs, the value is reset to a plain \"test\" and is not useful.\n\n\"timeincl\"\nFrom itime.U:\n\nThis variable holds the full path of the included time header(s).\n\n\"timetype\"\nFrom dtime.U:\n\nThis variable holds the type returned by time(). It can be long, or timet on \"BSD\" sites\n(in which case should be included). Anyway, the type Timet should be used.\n\n\"tmpnamrproto\"\nFrom dtmpnamr.U:\n\nThis variable encodes the prototype of tmpnamr. It is zero if dtmpnamr is undef, and one\nof the \"REENTRANTPROTOTABC\" macros of reentr.h if dtmpnamr is defined.\n\n\"to\"\nFrom Cross.U:\n\nThis variable contains the command used by Configure to copy to from the target host. Useful\nand available only during Perl build. The string \":\" if not cross-compiling.\n\n\"touch\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ntouch program. After Configure runs, the value is reset to a plain \"touch\" and is not\nuseful.\n\n\"tr\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\ntr program. After Configure runs, the value is reset to a plain \"tr\" and is not useful.\n\n\"trnl\"\nFrom trnl.U:\n\nThis variable contains the value to be passed to the tr(1) command to transliterate a\nnewline. Typical values are \"\\012\" and \"\\n\". This is needed for \"EBCDIC\" systems where\nnewline is not necessarily \"\\012\".\n\n\"troff\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"ttynamerproto\"\nFrom dttynamer.U:\n\nThis variable encodes the prototype of ttynamer. It is zero if dttynamer is undef, and\none of the \"REENTRANTPROTOTABC\" macros of reentr.h if dttynamer is defined.\n\nu\n\"u16size\"\nFrom perlxv.U:\n\nThis variable is the size of an U16 in bytes.\n\n\"u16type\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's U16.\n\n\"u32size\"\nFrom perlxv.U:\n\nThis variable is the size of an U32 in bytes.\n\n\"u32type\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's U32.\n\n\"u64size\"\nFrom perlxv.U:\n\nThis variable is the size of an U64 in bytes.\n\n\"u64type\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's U64.\n\n\"u8size\"\nFrom perlxv.U:\n\nThis variable is the size of an U8 in bytes.\n\n\"u8type\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's U8.\n\n\"uidformat\"\nFrom uidf.U:\n\nThis variable contains the format string used for printing a Uidt.\n\n\"uidsign\"\nFrom uidsign.U:\n\nThis variable contains the signedness of a uidtype. 1 for unsigned, -1 for signed.\n\n\"uidsize\"\nFrom uidsize.U:\n\nThis variable contains the size of a uidtype in bytes.\n\n\"uidtype\"\nFrom uidtype.U:\n\nThis variable defines Uidt to be something like uidt, int, ushort, or whatever type is\nused to declare user ids in the kernel.\n\n\"uname\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nuname program. After Configure runs, the value is reset to a plain \"uname\" and is not\nuseful.\n\n\"uniq\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nuniq program. After Configure runs, the value is reset to a plain \"uniq\" and is not useful.\n\n\"uquadtype\"\nFrom quadtype.U:\n\nThis variable defines Uquadt to be something like unsigned long, unsigned int, unsigned\nlong long, uint64t, or whatever type is used for 64-bit integers.\n\n\"use64bitall\"\nFrom use64bits.U:\n\nThis variable conditionally defines the USE64BITALL symbol, and indicates that 64-bit\ninteger types should be used when available. The maximal possible 64-bitness is employed:\nLP64 or ILP64, meaning that you will be able to use more than 2 gigabytes of memory. This\nmode is even more binary incompatible than USE64BITINT. You may not be able to run the\nresulting executable in a 32-bit \"CPU\" at all or you may need at least to reboot your \"OS\"\nto 64-bit mode.\n\n\"use64bitint\"\nFrom use64bits.U:\n\nThis variable conditionally defines the USE64BITINT symbol, and indicates that 64-bit\ninteger types should be used when available. The minimal possible 64-bitness is employed,\njust enough to get 64-bit integers into Perl. This may mean using for example \"long longs\",\nwhile your memory may still be limited to 2 gigabytes.\n\n\"usecbacktrace\"\nFrom usebacktrace.U:\n\nThis variable indicates whether we are compiling with backtrace support.\n\n\"usecrosscompile\"\nFrom Cross.U:\n\nThis variable conditionally defines the \"USECROSSCOMPILE\" symbol, and indicates that Perl\nhas been cross-compiled.\n\n\"usedefaultstrict\"\nFrom usedefaultstrict.U:\n\nThis setting provides a mechanism for perl developers to enable strict by default. These\ndefaults do not apply when perl is run via -e or -E.\n\n\"usedevel\"\nFrom Devel.U:\n\nThis variable indicates that Perl was configured with development features enabled. This\nshould not be done for production builds.\n\n\"usedl\"\nFrom dlsrc.U:\n\nThis variable indicates if the system supports dynamic loading of some sort. See also dlsrc\nand dlobj.\n\n\"usedtrace\"\nFrom usedtrace.U:\n\nThis variable indicates whether we are compiling with dtrace support. See also dtrace.\n\n\"usefaststdio\"\nFrom usefaststdio.U:\n\nThis variable conditionally defines the \"USEFASTSTDIO\" symbol, and indicates that Perl\nshould be built to use \"fast stdio\". Defaults to define in Perls 5.8 and earlier, to undef\nlater.\n\n\"useithreads\"\nFrom usethreads.U:\n\nThis variable conditionally defines the \"USEITHREADS\" symbol, and indicates that Perl\nshould be built to use the interpreter-based threading implementation.\n\n\"usekernprocpathname\"\nFrom usekernprocpathname.U:\n\nThis variable, indicates that we can use sysctl with \"KERNPROCPATHNAME\" to get a full path\nfor the executable, and hence convert $^X to an absolute path.\n\n\"uselanginfo\"\nFrom Extensions.U:\n\nThis variable holds either \"true\" or \"false\" to indicate whether the I18N::Langinfo\nextension should be used. The sole use for this currently is to allow an easy mechanism for\nusers to skip this extension from the Configure command line.\n\n\"uselargefiles\"\nFrom uselfs.U:\n\nThis variable conditionally defines the \"USELARGEFILES\" symbol, and indicates that large\nfile interfaces should be used when available.\n\n\"uselongdouble\"\nFrom uselongdbl.U:\n\nThis variable conditionally defines the \"USELONGDOUBLE\" symbol, and indicates that long\ndoubles should be used when available.\n\n\"usemallocwrap\"\nFrom mallocsrc.U:\n\nThis variable contains y if we are wrapping malloc to prevent integer overflow during size\ncalculations.\n\n\"usemorebits\"\nFrom usemorebits.U:\n\nThis variable conditionally defines the \"USEMOREBITS\" symbol, and indicates that explicit\n64-bit interfaces and long doubles should be used when available.\n\n\"usemultiplicity\"\nFrom usemultiplicity.U:\n\nThis variable conditionally defines the \"MULTIPLICITY\" symbol, and indicates that Perl\nshould be built to use multiplicity.\n\n\"usemymalloc\"\nFrom mallocsrc.U:\n\nThis variable contains y if the malloc that comes with this package is desired over the\nsystem's version of malloc. People often include special versions of malloc for efficiency,\nbut such versions are often less portable. See also mallocsrc and mallocobj. If this is \"y\",\nthen -lmalloc is removed from $libs.\n\n\"usenm\"\nFrom usenm.U:\n\nThis variable contains \"true\" or \"false\" depending whether the nm extraction is wanted or\nnot.\n\n\"usensgetexecutablepath\"\nFrom usensgetexecutablepath.U:\n\nThis symbol, if defined, indicates that we can use NSGetExecutablePath and realpath to get\na full path for the executable, and hence convert $^X to an absolute path.\n\n\"useopcode\"\nFrom Extensions.U:\n\nThis variable holds either \"true\" or \"false\" to indicate whether the Opcode extension should\nbe used. The sole use for this currently is to allow an easy mechanism for users to skip the\nOpcode extension from the Configure command line.\n\n\"useperlio\"\nFrom useperlio.U:\n\nThis variable conditionally defines the \"USEPERLIO\" symbol, and indicates that the PerlIO\nabstraction should be used throughout.\n\n\"useposix\"\nFrom Extensions.U:\n\nThis variable holds either \"true\" or \"false\" to indicate whether the \"POSIX\" extension\nshould be used. The sole use for this currently is to allow an easy mechanism for hints\nfiles to indicate that \"POSIX\" will not compile on a particular system.\n\n\"usequadmath\"\nFrom usequadmath.U:\n\nThis variable conditionally defines the \"USEQUADMATH\" symbol, and indicates that the\nquadmath library float128 long doubles should be used when available.\n\n\"usereentrant\"\nFrom usethreads.U:\n\nThis variable conditionally defines the \"USEREENTRANTAPI\" symbol, which indicates that the\nthread code may try to use the various r versions of library functions. This is only\npotentially meaningful if usethreads is set and is very experimental, it is not even\nprompted for.\n\n\"userelocatableinc\"\nFrom bin.U:\n\nThis variable is set to true to indicate that perl should relocate @\"INC\" entries at runtime\nbased on the path to the perl binary. Any @\"INC\" paths starting .../ are relocated relative\nto the directory containing the perl binary, and a logical cleanup of the path is then made\naround the join point (removing dir/../ pairs)\n\n\"useshrplib\"\nFrom libperl.U:\n\nThis variable is set to \"true\" if the user wishes to build a shared libperl, and \"false\"\notherwise.\n\n\"usesitecustomize\"\nFrom dsitecustomize.U:\n\nThis variable is set to true when the user requires a mechanism that allows the sysadmin to\nadd entries to @\"INC\" at runtime. This variable being set, makes perl run\n$sitelib/sitecustomize.pl at startup.\n\n\"usesocks\"\nFrom usesocks.U:\n\nThis variable conditionally defines the \"USESOCKS\" symbol, and indicates that Perl should\nbe built to use \"SOCKS\".\n\n\"usethreads\"\nFrom usethreads.U:\n\nThis variable conditionally defines the \"USETHREADS\" symbol, and indicates that Perl should\nbe built to use threads.\n\n\"usevendorprefix\"\nFrom vendorprefix.U:\n\nThis variable tells whether the vendorprefix and consequently other vendor* paths are in\nuse.\n\n\"useversionedarchname\"\nFrom archname.U:\n\nThis variable indicates whether to include the $apiversionstring as a component of the\n$archname.\n\n\"usevfork\"\nFrom dvfork.U:\n\nThis variable is set to true when the user accepts to use vfork. It is set to false when no\nvfork is available or when the user explicitly requests not to use vfork.\n\n\"usrinc\"\nFrom usrinc.U:\n\nThis variable holds the path of the include files, which is usually /usr/include. It is\nmainly used by other Configure units.\n\n\"uuname\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"uvoformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"UV\" as an unsigned octal\ninteger.\n\n\"uvsize\"\nFrom perlxv.U:\n\nThis variable is the size of a \"UV\" in bytes.\n\n\"uvtype\"\nFrom perlxv.U:\n\nThis variable contains the C type used for Perl's \"UV\".\n\n\"uvuformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"UV\" as an unsigned\ndecimal integer.\n\n\"uvxformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"UV\" as an unsigned\nhexadecimal integer in lowercase abcdef.\n\n\"uvXUformat\"\nFrom perlxvf.U:\n\nThis variable contains the format string used for printing a Perl \"UV\" as an unsigned\nhexadecimal integer in uppercase \"ABCDEF\".\n\nv\n\"vendorarch\"\nFrom vendorarch.U:\n\nThis variable contains the value of the \"PERLVENDORARCH\" symbol. It may have a ~ on the\nfront. The standard distribution will put nothing in this directory. Vendors who distribute\nperl may wish to place their own architecture-dependent modules and extensions in this\ndirectory with MakeMaker Makefile.PL \"INSTALLDIRS\"=vendor or equivalent. See \"INSTALL\" for\ndetails.\n\n\"vendorarchexp\"\nFrom vendorarch.U:\n\nThis variable is the ~name expanded version of vendorarch, so that you may use it directly\nin Makefiles or shell scripts.\n\n\"vendorbin\"\nFrom vendorbin.U:\n\nThis variable contains the eventual value of the \"VENDORBIN\" symbol. It may have a ~ on the\nfront. The standard distribution will put nothing in this directory. Vendors who distribute\nperl may wish to place additional binaries in this directory with MakeMaker Makefile.PL\n\"INSTALLDIRS\"=vendor or equivalent. See \"INSTALL\" for details.\n\n\"vendorbinexp\"\nFrom vendorbin.U:\n\nThis variable is the ~name expanded version of vendorbin, so that you may use it directly in\nMakefiles or shell scripts.\n\n\"vendorhtml1dir\"\nFrom vendorhtml1dir.U:\n\nThis variable contains the name of the directory for html pages. It may have a ~ on the\nfront. The standard distribution will put nothing in this directory. Vendors who distribute\nperl may wish to place their own html pages in this directory with MakeMaker Makefile.PL\n\"INSTALLDIRS\"=vendor or equivalent. See \"INSTALL\" for details.\n\n\"vendorhtml1direxp\"\nFrom vendorhtml1dir.U:\n\nThis variable is the ~name expanded version of vendorhtml1dir, so that you may use it\ndirectly in Makefiles or shell scripts.\n\n\"vendorhtml3dir\"\nFrom vendorhtml3dir.U:\n\nThis variable contains the name of the directory for html library pages. It may have a ~ on\nthe front. The standard distribution will put nothing in this directory. Vendors who\ndistribute perl may wish to place their own html pages for modules and extensions in this\ndirectory with MakeMaker Makefile.PL \"INSTALLDIRS\"=vendor or equivalent. See \"INSTALL\" for\ndetails.\n\n\"vendorhtml3direxp\"\nFrom vendorhtml3dir.U:\n\nThis variable is the ~name expanded version of vendorhtml3dir, so that you may use it\ndirectly in Makefiles or shell scripts.\n\n\"vendorlib\"\nFrom vendorlib.U:\n\nThis variable contains the eventual value of the \"VENDORLIB\" symbol, which is the name of\nthe private library for this package. The standard distribution will put nothing in this\ndirectory. Vendors who distribute perl may wish to place their own modules in this directory\nwith MakeMaker Makefile.PL \"INSTALLDIRS\"=vendor or equivalent. See \"INSTALL\" for details.\n\n\"vendorlibstem\"\nFrom vendorlib.U:\n\nThis variable is $vendorlibexp with any trailing version-specific component removed. The\nelements in incversionlist (incversionlist.U) can be tacked onto this variable to\ngenerate a list of directories to search.\n\n\"vendorlibexp\"\nFrom vendorlib.U:\n\nThis variable is the ~name expanded version of vendorlib, so that you may use it directly in\nMakefiles or shell scripts.\n\n\"vendorman1dir\"\nFrom vendorman1dir.U:\n\nThis variable contains the name of the directory for man1 pages. It may have a ~ on the\nfront. The standard distribution will put nothing in this directory. Vendors who distribute\nperl may wish to place their own man1 pages in this directory with MakeMaker Makefile.PL\n\"INSTALLDIRS\"=vendor or equivalent. See \"INSTALL\" for details.\n\n\"vendorman1direxp\"\nFrom vendorman1dir.U:\n\nThis variable is the ~name expanded version of vendorman1dir, so that you may use it\ndirectly in Makefiles or shell scripts.\n\n\"vendorman3dir\"\nFrom vendorman3dir.U:\n\nThis variable contains the name of the directory for man3 pages. It may have a ~ on the\nfront. The standard distribution will put nothing in this directory. Vendors who distribute\nperl may wish to place their own man3 pages in this directory with MakeMaker Makefile.PL\n\"INSTALLDIRS\"=vendor or equivalent. See \"INSTALL\" for details.\n\n\"vendorman3direxp\"\nFrom vendorman3dir.U:\n\nThis variable is the ~name expanded version of vendorman3dir, so that you may use it\ndirectly in Makefiles or shell scripts.\n\n\"vendorprefix\"\nFrom vendorprefix.U:\n\nThis variable holds the full absolute path of the directory below which the vendor will\ninstall add-on packages. See \"INSTALL\" for usage and examples.\n\n\"vendorprefixexp\"\nFrom vendorprefix.U:\n\nThis variable holds the full absolute path of the directory below which the vendor will\ninstall add-on packages. Derived from vendorprefix.\n\n\"vendorscript\"\nFrom vendorscript.U:\n\nThis variable contains the eventual value of the \"VENDORSCRIPT\" symbol. It may have a ~ on\nthe front. The standard distribution will put nothing in this directory. Vendors who\ndistribute perl may wish to place additional executable scripts in this directory with\nMakeMaker Makefile.PL \"INSTALLDIRS\"=vendor or equivalent. See \"INSTALL\" for details.\n\n\"vendorscriptexp\"\nFrom vendorscript.U:\n\nThis variable is the ~name expanded version of vendorscript, so that you may use it directly\nin Makefiles or shell scripts.\n\n\"version\"\nFrom patchlevel.U:\n\nThe full version number of this package, such as 5.6.1 (or 561). This combines revision,\npatchlevel, and subversion to get the full version number, including any possible\nsubversions. This is suitable for use as a directory name, and hence is filesystem\ndependent.\n\n\"versionpatchlevelstring\"\nFrom patchlevel.U:\n\nThis is a string combining version, subversion and perlpatchlevel (if perlpatchlevel is\nnon-zero). It is typically something like 'version 7 subversion 1' or 'version 7 subversion\n1 patchlevel 11224' It is computed here to avoid duplication of code in myconfig.SH and\nlib/Config.pm.\n\n\"versiononly\"\nFrom versiononly.U:\n\nIf set, this symbol indicates that only the version-specific components of a perl\ninstallation should be installed. This may be useful for making a test installation of a new\nversion without disturbing the existing installation. Setting versiononly is equivalent to\nsetting installperl's -v option. In particular, the non-versioned scripts and programs such\nas a2p, c2ph, h2xs, pod2*, and perldoc are not installed (see \"INSTALL\" for a more complete\nlist). Nor are the man pages installed. Usually, this is undef.\n\n\"vi\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\nx\n\"xlibpth\"\nFrom libpth.U:\n\nThis variable holds extra path (space-separated) used to find libraries on this platform,\nfor example \"CPU\"-specific libraries (on multi-\"CPU\" platforms) may be listed here.\n\ny\n\"yacc\"\nFrom yacc.U:\n\nThis variable holds the name of the compiler compiler we want to use in the Makefile. It can\nbe yacc, byacc, or bison -y.\n\n\"yaccflags\"\nFrom yacc.U:\n\nThis variable contains any additional yacc flags desired by the user. It is up to the\nMakefile to use this.\n\nz\n\"zcat\"\nFrom Loc.U:\n\nThis variable is defined but not used by Configure. The value is the empty string and is not\nuseful.\n\n\"zip\"\nFrom Loc.U:\n\nThis variable is used internally by Configure to determine the full pathname (if any) of the\nzip program. After Configure runs, the value is reset to a plain \"zip\" and is not useful.\n", "subsections": [] }, "GIT DATA": { "content": "Information on the git commit from which the current perl binary was compiled can be found in\nthe variable $Config::GitData. The variable is a structured string that looks something like\nthis:\n\ngitcommitid='ea0c2dbd5f5ac6845ecc7ec6696415bf8e27bd52'\ngitdescribe='GitLive-blead-1076-gea0c2db'\ngitbranch='smartmatch'\ngituncommittedchanges=''\ngitcommitidtitle='Commit id:'\ngitcommitdate='2009-05-09 17:47:31 +0200'\n\nIts format is not guaranteed not to change over time.\n", "subsections": [] }, "NOTE": { "content": "This module contains a good example of how to use tie to implement a cache and an example of how\nto make a tied variable readonly to those outside of it.\n", "subsections": [] } }, "summary": "Config - access Perl configuration information", "flags": [], "examples": [ "Here's a more sophisticated example of using %Config:", "use Config;", "use strict;", "my %signum;", "my @signame;", "unless($Config{signame} && $Config{signum}) {", "die \"No sigs?\";", "} else {", "my @names = split ' ', $Config{signame};", "@signum{@names} = split ' ', $Config{signum};", "foreach (@names) {", "$signame[$signum{$}] ||= $;", "print \"signal #17 = $signame[17]\\n\";", "if ($signum{ALRM}) {", "print \"SIGALRM is $signum{ALRM}\\n\";" ], "see_also": [] }