Your package monodevelop-vala failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=6960785 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 904264 [details] build.log
Created attachment 904265 [details] root.log
Created attachment 904266 [details] state.log
Created attachment 910209 [details] Patch for rawhide Obsolete dep on vala-0.18 (rawhide is at 0.24); patch for rawhide attached.