I think compat-gcc-34-g77 should be dropped from autoconf213's BuildRequires because autoconf213 is noarch and compat-gcc-34-g77 is not available for aarch64. (same situation as automake bug https://bugzilla.redhat.com/show_bug.cgi?id=1088854)
As far as I can tell, it is only used for tests anyway, so maybe the g77 tests could be skipped?
Thanks, built in f21+. Pavel