I just noticed in TFM for 0.15 that the section "Supported systems" is somewhat dated. Might be time to give it a little refresh, as certainly Geany compiles and runs successfully on Fedora 7/8/9 now too, and I dare say it also works on Debian Lenny. Also, your website page on third party packages lists many more distros it apparently compiles on.
Yup, this is really outdated. Thanks for the hint, I'll update this section soon, remove the list of distributions and instead add a link to the Third Party packages site.
You could also bump "FreeBSD 6" to "FreeBSD 7", "FreeBSD 6+" or better to just plain "FreeBSD" as it's for other BSDs ("NetBSD", "OpenBSD") in Third Party package site.