# emerge -av app-portage/layman app-portage/autounmask
# echo "source /usr/portage/local/layman/make.conf" >> /etc/make.conf
layman -f -o
http://darkbasic.homelinux.com/layman.xml -a planeshift
autounmask -n games-rpg/planeshift-0.5.01-r5444 (replace with the current version, omitt the version to see which versions are available)
You should add a directory named "profiles" with a file named "repo_name" (file content is "planeshift") for portage 2.2 users.
Very well, thank you for providing a git repository
Edit: btw I think you should ask the permission to redistribute planeshift-data, search for games-rpg/planeshift-art in zugaina overlay
It's in their interest to not overload the main server...
P.S. r5444 does not compile for me