Your package graphviz failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17719296 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1252410 [details] build.log
Created attachment 1252411 [details] root.log
Created attachment 1252412 [details] state.log
Error: nothing provides libgfortran.so.3()(64bit) needed by R-core-3.3.2-4.fc26.ppc64 I think R needs recompilation.
Taking. Seems as if the R-core/fortran deps have been rebuilt. A scratch-build just succeeded, I am going to launch a real build
https://koji.fedoraproject.org/koji/buildinfo?buildID=844286