Usage: /usr/bin/autoupdate [OPTION]... [TEMPLATE-FILE]...

Update each TEMPLATE-FILE if given, or 'configure.ac' if present,
or else 'configure.in', to the syntax of the current version of
Autoconf.  The original files are backed up.

Operation modes:
  -h, --help                 print this help, then exit
  -V, --version              print version number, then exit
  -v, --verbose              verbosely report processing
  -d, --debug                don't remove temporary files
  -f, --force                consider all files obsolete

Library directories:
  -B, --prepend-include=DIR  prepend directory DIR to search path
  -I, --include=DIR          append directory DIR to search path

Report bugs in the tracker at <https://savannah.gnu.org/projects/autoconf>
or by email to <bug-autoconf@gnu.org>.

The full documentation for Autoconf can be read via 'info autoconf',
or on the Web at <https://www.gnu.org/software/autoconf/manual/>.