There are hard coded dependancies on XFree86-libs package, which
needs to be fixed before xorg-x11 can be enabled in the development
I haven't investigated this deeper yet, but will update the
report unless it's fixed before I get to looking deeper myself. ;o)
Most likely, this is just a broken dependancy on XFree86-libs that
should instead be XFree86-devel.
Fixed in tk-8.4.5-7 in rawhide