3 James Henstridge <james@daa.com.au> original pkg-config
4 Tim Janik <timj@gtk.org> the PKG_CHECK_VERSION macro
5 Havoc Pennington <hp@redhat.com> rewrite in C
6 Scott James Remnant <scott@netsplit.com> m4 cleanups and maintainer
11 Tollef Fog Heen <tfheen@err.no>