I ran `CXX=eg++ CC=egcc ./autogen.sh`
It'd like to have a fix for this, but I'm not sure if it's worth maintaining our own version of the rule.
Probably not. I ran `gmake` now and it's working. Maybe just a doc update? I noticed that BSD isn't listed on [the HowTos](https://wiki.geany.org/howtos/start).