Since working with the OpenAlchemist code, I've been looking at ClanLib. The project seems to have died. Fedora has 2.3.7. Debian has an earlier version. No one seems to be packaging 5.0. I can only assume API changes break programs. Fedora has OpenAlchemist and Super Methane Bros using the library. Debian has Trophy. Probably the most notable game using the library was Pingus but it switched off of it. I found this list of games:
https://www.seul.org/~grumbel/tmp/clanlib/games.html
I'm kinda tempted to try to get Mojotron running at some point but who know if I will ever get to that.