Your package GMT failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17699852 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1251060 [details] build.log
Created attachment 1251061 [details] root.log
Created attachment 1251062 [details] state.log
Taking. The cause for the FTBFS seems to have been the GCC ppc64le issues, which meanwhile appear to have been resolved. A scratch-build has just succeed, so I am going to launch a real build.
corsepiu's GMT-5.3.1-2.fc26 completed http://koji.fedoraproject.org/koji/buildinfo?buildID=840051