Your package steghide failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17792259 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1254700 [details] build.log
Created attachment 1254701 [details] root.log
Created attachment 1254702 [details] state.log
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle. Changing version to '26'.
Taking. This package suffers from its old age and multiple places. The issue triggering this FTBFS is a bug in the logic in package's hash_{map|set} wrappers, which causes building to choose the wrong namespace for hash_{map|set} types when using gcc-7. I am going to apply larger changes which should resolve the worst issues this package suffers from.
corsepiu's steghide-0.5.1-30.fc27 completed http://koji.fedoraproject.org/koji/buildinfo?buildID=863565
fc26: https://koji.fedoraproject.org/koji/buildinfo?buildID=863639