Your package rubygem-execjs failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7000785 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906081 [details] build.log
Created attachment 906082 [details] root.log
Created attachment 906083 [details] state.log