I've added games-strategy/freecol-0.8.1 to the sabayon portage overlay.
Although games-strategy/freecol is available in Gentoo's portage, the most recent version is 0.7.4.
So if you want to check out the latest version, we've got it available for you now.
Gigabyte GA-P35-DS3L - Intel(R) Core(TM)2 Duo CPU E6750@ 2.66GHz
nVidia GeForce 7600 GS
2 GB RAM