Building unregisterised for FreeBSD/amd64

Hi, I'm trying to get ghc-6.6 running on my FreeBSD/amd64 box. It seems as if the build instructions are stale again. When I run $ cd /tmp/ghc-6.6/rts && gmake boot && gmake it falls over in the RTS, as noted in the documentation. But at the next step, when the libraries are built, $ cd ../libraries $ gmake boot && gmake cabal fails to build because it requires HSrts. This aborts the library build leaving me with an incomplete set of libraries. Is there a simple way to tell the build not to make cabal? Best, Greg