Your package R-multcomp failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17701046 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1251250 [details] build.log
Created attachment 1251251 [details] root.log
Created attachment 1251252 [details] state.log
zbyszek's R-multcomp-1.4.5-3.fc26 completed http://koji.fedoraproject.org/koji/buildinfo?buildID=840210