( Invoking autoreconf

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 2.5 Using `autoreconf' to Update `configure' Scripts
 If you have a lot of Autoconf-generated `configure' scripts, the
 `autoreconf' program can save you some work.  It runs `autoconf' (and
 `autoheader', where appropriate) repeatedly to remake the Autoconf
 `configure' scripts and configuration header templates in the directory
 tree rooted at the current directory.  By default, it only remakes
 those files that are older than their `' or (if present)
 `aclocal.m4'.  Since `autoheader' does not change the timestamp of its
 output file if the file wouldn't be changing, this is not necessarily
 the minimum amount of work.  If you install a new version of Autoconf,
 you can make `autoreconf' remake _all_ of the files by giving it the
 `--force' option.
    If you give `autoreconf' the `--macrodir=DIR' or `--localdir=DIR'
 options, it passes them down to `autoconf' and `autoheader' (with
 relative paths adjusted properly).
    `autoreconf' does not support having, in the same directory tree,
 both directories that are parts of a larger package (sharing
 `aclocal.m4' and `acconfig.h'), and directories that are independent
 packages (each with their own `aclocal.m4' and `acconfig.h').  It
 assumes that they are all part of the same package, if you use
 `--localdir', or that each directory is a separate package, if you
 don't use it.  This restriction may be removed in the future.
     Automatic Remaking, for `Makefile' rules to automatically
 remake `configure' scripts when their source files change.  That method
 handles the timestamps of configuration header templates properly, but
 does not pass `--macrodir=DIR' or `--localdir=DIR'.
 `autoreconf' accepts the following options:
      Print a summary of the command line options and exit.
      Remake even `configure' scripts and configuration headers that are
      newer than their input files (`' and, if present,
 `-l DIR'
      Have `autoconf' and `autoheader' look for the package files
      `aclocal.m4' and (`autoheader' only) `acconfig.h' (but not
      `' and `') in directory DIR instead of in the
      directory containing each `'.
 `-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.
      Print the name of each directory where `autoreconf' runs
      `autoconf' (and `autoheader', if appropriate).
      Print the version number of Autoconf and exit.
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