Up to date builds are found in our sft overlay.
For automatic updates, install the overlay with layman!
# add the sft-overlay
layman -a sft
# install openage
emerge -avt openage
This will install the latest release.
If you want to install the latest git version:
# In /etc/portage/package.keywords, add
=games-strategy/openage-9999::sft **
Beware, the git version does not do automatic updates.
You have to explicitly "reinstall" openage or use app-portage/smart-live-rebuild
.