fifechan : Lightweight cross platform GUI C++ library designed for games ( http://fifengine.github.io/fifechan/ )
fifengine : Flexible Isometric Free Engine, 2D ( http://fifengine.de )
scummvm : Reimplementation of the SCUMM game engine used in Lucasarts adventures ( https://www.scummvm.org/ )
stratagus : A realtime strategy game engine ( https://launchpad.net/stratagus/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a poly-c
For Paludis use this rsync : rsync://gentoo.zugaina.org/poly-c-portage
If you have a problem : ycarus(-at-)zugaina.org