xorg-x11-devel doesn't exist anymore, it is replaced by many smaller specific devel packages. groff needs to BuildReq on one of these new packages instead of the generic. This needs to be fixed prior to the FC5Test2 freeze.
I'm looking into it, the problem is that the package is no more rebuildable with gcc-4.1 because of the crappy groff's C++ style and gcc now seems to be more strict on this.
Fixed since groff-1.18.1.1-6.