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Using autoupdate to Modernize `configure.ac'

The autoupdate program updates a `configure.ac' 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. See section Macro Names, for a description of the new scheme. Although the old names still work (see section Obsolete Macros, for a list of the old macros and the corresponding new names), you can make your `configure.ac' 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.ac', 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.ac' and writes the updated file to the standard output.

autoupdate accepts the following options:

@option{--help}

@option{-h}

Print a summary of the command line options and exit.

@option{--version}

@option{-V}

Print the version number of Autoconf and exit.

@option{--verbose}

@option{-v}

Report processing steps.

@option{--debug}

@option{-d}

Don't remove the temporary files.

@option{--autoconf-dir=dir}

@option{-A dir}

Override the location where the installed Autoconf data files are looked for. You can also set the AC_MACRODIR environment variable to a directory; this option overrides the environment variable. This option is rarely needed and dangerous; it is only used when one plays with different versions of Autoconf simultaneously.

@option{--localdir=dir}

@option{-l dir}

Look for the package file `aclocal.m4' in directory dir instead of in the current directory.

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