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Third party macros can be downloaded from the Autoconf Macro Archive.
Autoconf's development tree is accessible via git; see the Autoconf Summary for details, or view the actual repository. Anonymous CVS access is also available, see README for more details. Patches relative to the current git version can be sent for review to the Autoconf Patches mailing list, with discussion on prior patches archived; and all commits are posted in the read-only Autoconf Commit mailing list, which is also archived. Because of its mission, the Autoconf package itself includes only a set of often-used macros that have already demonstrated their usefulness. Nevertheless, if you wish to share your macros, or find existing ones, see the Autoconf Macro Archive.