The Autoconf Macro Archive aims to provide a collection of reusable Autoconf macros as free software. The archive currently features more than 300 macros which perform portability tests ranging from compiler support for weird language extensions to automatic generation of sophisticated Automake rules. However, all these macros have been contributed by friendly supporters of the cause from all over the Internet; the archive really just collects and distributes them. WWW: http://autoconf-archive.cryp.to/