Your package octave failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=6972537 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 904854 [details] build.log
Created attachment 904855 [details] root.log
Created attachment 904856 [details] state.log
Should be fixed in octave-3.8.2-1.0.rc1
I mean 3.8.2-0.1.rc1