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Alien::Autotools - Build and install the GNU build system.

=head1 SYNOPSIS

    use Alien::Autotools qw(autoconf_dir);
    print autoconf_dir(), "\n";

=head1 DESCRIPTION

This module looks for minimum versions of the tools that make up the "GNU build
system": version 2.68 of C<autoconf>, version 1.11.0 of C<automake>, and version
2.4.0 of C<libtool>. For each tool that is not found or below the minimum
version, it is downloaded, compiled and installed it to the B<Alien-Autotools>
distribution's shared directory. Compilation can be made to happen regardless
of whether minimum versions are already found by setting the  environment
variable, C<COMPILE_ALIEN_AUTOTOOLS>, to a true value.

Tool source archives are downloaded from the official GNU FTP server,
L<ftp://ftp.gnu.org/>.