(autocf21.info.gz) UNIX Variants

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 4.10 UNIX Variants
 ==================
 
 The following macros check for certain operating systems that need
 special treatment for some programs, due to exceptional oddities in
 their header files or libraries.  These macros are warts; they will be
 replaced by a more systematic approach, based on the functions they make
 available or the environments they provide.
 
  -- Macro: AC_AIX
      If on AIX, define `_ALL_SOURCE'.  Allows the use of some BSD
      functions.  Should be called before any macros that run the C
      compiler.
 
  -- Macro: AC_DYNIX_SEQ
      If on Dynix/PTX (Sequent UNIX), add `-lseq' to output variable
      `LIBS'.  This macro is obsolete; instead, use `AC_FUNC_GETMNTENT'.
 
  -- Macro: AC_IRIX_SUN
      If on IRIX (Silicon Graphics UNIX), add `-lsun' to output variable
      `LIBS'.  This macro is obsolete.  If you were using it to get
      `getmntent', use `AC_FUNC_GETMNTENT' instead.  If you used it for
      the NIS versions of the password and group functions, use
      `AC_CHECK_LIB(sun, getpwnam)'.
 
  -- Macro: AC_ISC_POSIX
      If on a POSIXized ISC UNIX, define `_POSIX_SOURCE' and add
      `-posix' (for the GNU C compiler) or `-Xp' (for other C compilers)
      to output variable `CC'.  This allows the use of POSIX facilities.
      Must be called after `AC_PROG_CC' and before any other macros
      that run the C compiler.
 
  -- Macro: AC_MINIX
      If on Minix, define `_MINIX' and `_POSIX_SOURCE' and define
      `_POSIX_1_SOURCE' to be 2.  This allows the use of POSIX
      facilities.  Should be called before any macros that run the C
      compiler.
 
  -- Macro: AC_SCO_INTL
      If on SCO UNIX, add `-lintl' to output variable `LIBS'.  This
      macro is obsolete; instead, use `AC_FUNC_STRFTIME'.
 
  -- Macro: AC_XENIX_DIR
      If on Xenix, add `-lx' to output variable `LIBS'.  Also, if
      `dirent.h' is being used, add `-ldir' to `LIBS'.  This macro is
      obsolete; use `AC_HEADER_DIRENT' instead.
 

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