Taken from PR 199753 with minor modifications.
Proposed commit message:
new port: security/rubygem-omniauth-shibboleth Ruby gem that implements an OmniAuth strategy for authenticating through Shibboleth (SAML) for usage in rubygem-onmiauth. WWW: https://github.com/toyokazu/omniauth-shibboleth PR: 199753 Submitted by: Torsten Zuehlsdorff <ports@toco-domains.de> Approved by: swills (mentor), mat (mentor)