# man > aclocal(1)

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## NAME
       aclocal - manual page for aclocal 1.16.5

## SYNOPSIS
       **aclocal** [_OPTION_]...

## DESCRIPTION
       Generate 'aclocal.m4' by scanning 'configure.ac' or 'configure.in'

## OPTIONS
       **--automake-acdir**=_DIR_
              directory holding automake-provided m4 files

       **--system-acdir**=_DIR_
              directory holding third-party system-wide files

       **--diff**[=_COMMAND_]
              run  COMMAND  [diff  **-u]**  on  M4  files  that  would be changed (implies **--install** and
              **--dry-run**)

### --dry-run
              pretend to, but do not actually update any file

### --force
              always update output file

       **--help** print this help, then exit

### -I

### --install
              copy third-party files to the first **-I** directory

       **--output**=_FILE_
              put output in FILE (default aclocal.m4)

### --print-ac-dir
              print name of directory holding system-wide third-party m4 files, then exit

### --verbose
              don't be silent

### --version
              print version number, then exit

### -W --warnings
              report the warnings falling in CATEGORY

### Warning categories include:
       cross  cross compilation issues

       gnu    GNU coding standards (default in gnu and gnits modes)

       obsolete
              obsolete features or constructions (default)

       override
              user redefinitions of Automake rules or variables

       portability
              portability issues (default in gnu and gnits modes)

       portability-recursive
              nested Make variables (default with **-Wportability**)

       extra-portability
              extra portability issues related to obscure tools

       syntax dubious syntactic constructs (default)

       unsupported
              unsupported or incomplete features (default)

       all    all the warnings

       no-CATEGORY
              turn off warnings in CATEGORY

       none   turn off all the warnings

       error  treat warnings as errors

## AUTHOR
       Written by Tom Tromey <<tromey@redhat.com>>

              and Alexandre Duret-Lutz <<adl@gnu.org>>.

## REPORTING BUGS
       Report bugs to <<bug-automake@gnu.org>>.
       GNU Automake home page: <<https://www.gnu.org/software/automake/>>.
       General help using GNU software: <<https://www.gnu.org/gethelp/>>.

## COPYRIGHT
       Copyright © 2021 Free Software Foundation, Inc.  License GPLv2+: GNU GPL version 2  or  later
       <<https://gnu.org/licenses/gpl-2.0.html>>
       This  is free software: you are free to change and redistribute it.  There is NO WARRANTY, to
       the extent permitted by law.

## SEE ALSO
       The full documentation for **aclocal** is maintained as a Texinfo manual.  If the **info** and  **aclo**‐‐
       **cal** programs are properly installed at your site, the command

              **info** **aclocal**

       should give you access to the complete manual.



GNU automake 1.16.5                          March 2022                                   [ACLOCAL(1)](https://www.chedong.com/phpMan.php/man/ACLOCAL/1/markdown)