curl - Add support for client-side URL transfer library
debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
dedicated - Add support for dedicated game servers (some packages do not provide clients and servers at the same time)
mumble - Adds player-location (positional audio) support to VoIP
