Your package botan2 failed to build from source in current F28. https://koji.fedoraproject.org/koji/taskinfo?taskID=25519795 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
Created attachment 1408243 [details] build.log
Created attachment 1408244 [details] root.log
Created attachment 1408245 [details] state.log
There is now an ExcludeArch: for ppc64le in the package spec. For progress on the actual issue see upstream GH https://github.com/randombit/botan/issues/1498
Fixed: https://koji.fedoraproject.org/koji/buildinfo?buildID=1060000