Building Chocolate Doom on Gentoo
From Chocolate Doom
A Chocolate Doom ebuild for Gentoo is located in the Sunrise overlay. Just add Sunrise overlay to your tree:
games-fps/chocolate-doom
to your /etc/portage/package.unmask file and
<games-fps/chocolate-doom-9999
to your /etc/portage/package.keywords file and finally:
emerge -av chocolate-doom