A gentoo overlay to install shibboleth-sp and its dependencies.
Add https://raw.github.com/flyser/shibboleth-overlay/master/repositories.xml to the overlays variable in in /etc/layman/layman.cfg.
Run layman -f && layman -a shibboleth && emerge -a shibboleth-sp
Clone https://github.com/flyser/shibboleth-overlay.git repository somewhere and add the path to the PORTDIR_OVERLAY variable in /etc/portage/make.conf
Note that it is currently unmaintaned, but as shibboleth does not release new versions that often, chances are good, that it is still current. If not, you can likely just rename the ebuilds to the new version number.