although you install in the right place, it is still broken, because you don't fix the definition -DGAMEDATADIR and the game will be unable to locate the data with custom GAMES_DATADIR set you should just pass the correct BINDIR and GAMEDATADIR to emake
+ 14 Apr 2013; Sergey Popov <pinkbyte@gentoo.org> color-lines-0.6.ebuild: + Respect path variables from games eclass, wrt bug #465770, thanks to Julian + Ospald. Add ~amd64-linux keyword