https://bugzilla.redhat.com/show_bug.cgi?id=860518
--- Comment #4 from Jens Petersen petersen@redhat.com --- (In reply to comment #2)
Thanks for the heads no on libnm-gtk-devel. Is there an alias for this in 17?
That would probably be a reasonable request.
You could try to work around it with an conditional (untested):
%if %{fedora} >= 18 Buildrequires: libnm-gtk-devel %else Buildrequires: NetworkManager-gtk-devel %endif
assuming they are compatible.