https://bugzilla.redhat.com/show_bug.cgi?id=1366881
--- Comment #13 from Zbigniew Jędrzejewski-Szmek zbyszek@in.waw.pl ---
cc1plus: all warnings being treated as errors
-Werror is a very bad idea. It can be useful in upstream development, where you are using a specific version of the compiler, and want to catch any warnings as they appear. But in a package in a distribution, new warnings will appear as the compiler is updated and becomes smarter, so -Werror will cause constant breakage. Just remove it.