Your package rubygem-dalli failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7000432 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906057 [details] build.log
Created attachment 906058 [details] root.log
Created attachment 906059 [details] state.log
Fixed by update to 2.7.2.