I'm failing to build WebKitGTK for armv7hl because it's running out of memory. I've documented this here: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/O3G7HNM45FXRQ4TTIHJKAKQPB7U4VR2E/ (Note that started out as an i686 issue, but the issue now affects armv7hl as well.)
Per the mailing list discussion, we tracked down the problem to a CMake change. Won't need this bug after all.