(autoconf.info)Invoking autoupdate

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13.4 Using 'autoupdate' to Modernize 'configure'
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The 'autoupdate' program updates a 'configure.in' file that calls
Autoconf macros by their old names to use the current macro names.  In
version 2 of Autoconf, most of the macros were renamed to use a more
uniform and descriptive naming scheme.  Note: Macro Names, for a
description of the new scheme.  Although the old names still work (Note:
Old Macro Names, for a list of the old macro names and the
corresponding new names), you can make your 'configure.in' files more
readable and make it easier to use the current Autoconf documentation if
you update them to use the new macro names.

   If given no arguments, 'autoupdate' updates 'configure.in', backing
up the original version with the suffix '~' (or the value of the
environment variable 'SIMPLE_BACKUP_SUFFIX', if that is set).  If you
give 'autoupdate' an argument, it reads that file instead of
'configure.in' and writes the updated file to the standard output.

'autoupdate' accepts the following options:

'--help'
'-h'
     Print a summary of the command line options and exit.

'--macrodir=DIR'
'-m DIR'
     Look for the Autoconf macro files in directory DIR instead of the
     default installation directory.  You can also set the 'AC_MACRODIR'
     environment variable to a directory; this option overrides the
     environment variable.

'--version'
     Print the version number of 'autoupdate' and exit.