The autoupdate2.13 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. Although the old names still work , 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, autoupdate2.13 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 autoupdate2.13 an argument, it reads that file
instead of configure.in and writes the updated file to the standard output.
autoconf2.13 accepts the following options:
--help-h Print a summary of the command line options and exit.
--macrodir=DIR-mDIR Look for the installed macro files in directory DIR. You can also set the AC_MACRODIR environment
variable to a directory; this option overrides the environment variable.
--version
Print the version number of Autoconf and exit.