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(autoconf.info)Notices

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Notices in `configure'
======================

   The following macros manage version numbers for `configure' scripts.
Using them is optional.

 - Macro: AC_PREREQ (VERSION)
     Ensure that a recent enough version of Autoconf is being used.  If
     the version of Autoconf being used to create `configure' is earlier
     than VERSION, print an error message to the standard error output
     and do not create `configure'.  For example:

          AC_PREREQ(2.53)

     This macro is the only macro that may be used before `AC_INIT', but
     for consistency, you are invited not to do so.

 - Macro: AC_COPYRIGHT (COPYRIGHT-NOTICE)
     State that, in addition to the Free Software Foundation's
     copyright on the Autoconf macros, parts of your `configure' are
     covered by the COPYRIGHT-NOTICE.

     The COPYRIGHT-NOTICE will show up in both the head of `configure'
     and in `configure --version'.

 - Macro: AC_REVISION (REVISION-INFO)
     Copy revision stamp REVISION-INFO into the `configure' script,
     with any dollar signs or double-quotes removed.  This macro lets
     you put a revision stamp from `configure.ac' into `configure'
     without RCS or `cvs' changing it when you check in `configure'.
     That way, you can determine easily which revision of
     `configure.ac' a particular `configure' corresponds to.

     For example, this line in `configure.ac':

          AC_REVISION($Revision: 1.30 $)

     produces this in `configure':

          #! /bin/sh
          # From configure.ac Revision: 1.30