# phpman > man > ExtUtils::MM_OS390

## NAME
    [ExtUtils::MM_OS390](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AMMOS390/markdown) - OS390 specific subclass of [ExtUtils::MM_Unix](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AMMUnix/markdown)

## SYNOPSIS
      Don't use this module directly.
      Use [ExtUtils::MM](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AMM/markdown) and let it choose.

## DESCRIPTION
    This is a subclass of [ExtUtils::MM_Unix](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AMMUnix/markdown) which contains functionality for OS390.

    Unless otherwise stated it works just like [ExtUtils::MM_Unix](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AMMUnix/markdown).

### Overriden methods
    xs_make_dynamic_lib
        Defines the recipes for the "dynamic_lib" section.

## AUTHOR
    Michael G Schwern <<schwern@pobox.com>> with code from [ExtUtils::MM_Unix](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AMMUnix/markdown)

## SEE ALSO
    [ExtUtils::MakeMaker](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AMakeMaker/markdown)