fairy-stockfish : Chess variant engine derived from Stockfish to support fairy chess variants ( https://github.com/ianfab/Fairy-Stockfish )
openriichi : OpenRiichi is an open source Japanese Mahjong client ( https://github.com/FluffyStuff/OpenRiichi )
rmahjong : Riichi Mahjong, the Japanese variant of the Chinese game Mahjong for 4 players ( https://github.com/spirali/rmahjong )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a guru
For Paludis use this rsync : rsync://gentoo.zugaina.org/guru-portage
If you have a problem : ycarus(-at-)zugaina.org