1The GNU Autoconf Archive is a collection of more than 450 macros for GNU 2Autoconf that have been contributed as free software by friendly supporters 3of the cause from all over the Internet. Every single one of those macros 4can be re-used without imposing any restrictions whatsoever on the licensing 5of the generated configure script. In particular, it is possible to use all 6those macros in configure scripts that are meant for non-free software. 7