There's a few problems I've had with the gtetrinet 0.6.2 ebuild. It's depending on gnome1 libraries (gconf1,orbit) which it shouldn't be. It also installs binaries in /usr/games instead of /usr/games/bin. I made an ebuild which solves these, although I just removed the depencies instead of updating them, I havn't really tried to fix that (I'm new to gentoo, havn't much experience with this stuff.) I made it inherit games, and use egamesconf instead of econf. It moves the binary into /usr/games/bin and runs prepgamesdirs before merging.
Created attachment 9000 [details] fix here is the ebuild
the `egamesconf` just breaks gtetirnet completely which is why i hadnt add it yet ;) but i added your other fixes, thanks http://cvs.gentoo.org/cgi-bin/viewcvs.cgi/gentoo-x86/app-games/gtetrinet/gtetrinet-0.6.2.ebuild.diff?r1=1.1&r2=1.2