(autoconf.info)Posix Variants

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5.12 Posix Variants

The following macro makes it possible to use features of Posix that are
extensions to C, as well as platform extensions not defined by Posix.

     This macro was introduced in Autoconf 2.60.  If possible, enable
     extensions to C or Posix on hosts that normally disable the
     extensions, typically due to standards-conformance namespace
     issues.  This should be called before any macros that run the C
     compiler.  The following preprocessor macros are defined where

          Enable extensions on GNU/Linux.

          Enable general extensions on Solaris.

          Enable threading extensions on Solaris.

          Enable extensions for the HP NonStop platform.

          Enable extensions for AIX 3, and for Interix.

          Enable Posix functions for Minix.

          Enable additional Posix functions for Minix.

          Identify Minix platform.  This particular preprocessor macro
          is obsolescent, and may be removed in a future release of

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