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 3.7 Version Numbers 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 on the standard error output
      and do not create `configure'.  For example:
 
           AC_PREREQ(1.8)
 
      This macro is useful if your `configure.in' relies on non-obvious
      behavior that changed between Autoconf releases.  If it merely
      needs recently added macros, then `AC_PREREQ' is less useful,
      because the `autoconf' program already tells the user which macros
      are not found.  The same thing happens if `configure.in' is
      processed by a version of Autoconf older than when `AC_PREREQ' was
      added.
 
  -- 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.in' into `configure'
      without RCS or CVS changing it when you check in `configure'.  That
      way, you can determine easily which revision of `configure.in' a
      particular `configure' corresponds to.
 
      It is a good idea to call this macro before `AC_INIT' so that the
      revision number is near the top of both `configure.in' and
      `configure'.  To support doing that, the `AC_REVISION' output
      begins with `#! /bin/sh', like the normal start of a `configure'
      script does.
 
      For example, this line in `configure.in':
 
           AC_REVISION($Revision: 1.30 $)dnl
 
      produces this in `configure':
 
           #! /bin/sh
           # From configure.in Revision: 1.30
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