Your package rubygem-memcache-client failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7002256 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906223 [details] build.log
Created attachment 906224 [details] root.log
Created attachment 906225 [details] state.log