Your package CImg failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17710803 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1251527 [details] build.log
Created attachment 1251528 [details] root.log
Created attachment 1251529 [details] state.log
FTBFS caused the initial mass rebuilt having been affected by https://bugzilla.redhat.com/show_bug.cgi?id=1417385
https://koji.fedoraproject.org/koji/taskinfo?taskID=17909692