Description:

GNU's Autoconf is a tool for configuring source code and Makefiles.
Using Autoconf, programmers can create portable and configurable
packages, since the person building the package is allowed to
specify various configuration options.

You should install Autoconf if you are developing software and you'd
like to use it to create shell scripts which will configure your
source code packages. If you are installing Autoconf, you will also
need to install the GNU m4 package.

Note that the Autoconf package is not required for the end user who
may be configuring software with an Autoconf-generated script;
Autoconf is only required for the generation of the scripts, not
their use.

-- PLEASE NOTICE ---> this version is meant to coexist with autoconf-2.5x;
to that end, the various binaries are actually linked to a script which
decides which version to execute. It tries to be clever and will execute
2.5x if `configure.ac' is present, or if `configure.in' contains AC_PREREQ
and the value's 3 first letters are stringwise greater than '2.1'. If
anything fails, you can manually select 2.13 by providing the environment
variable WANT_AUTOCONF_2_1 set to `1' (use WANT_AUTOCONF_2_5 if you want
the 2.5x version).