Your package rubygem-omniauth failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7002937 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906284 [details] build.log
Created attachment 906285 [details] root.log
Created attachment 906286 [details] state.log
Cause is bug 1083715 (rubygem-simplecov 0.8.2 needs rubygem-docile, not yet in Fedora)
rubygem-docile is in now, so this just needs to be resubmitted to koji. Successful scratch build: https://koji.fedoraproject.org/koji/taskinfo?taskID=7107735
Rebuilt, thanks Yaakov!