Hello Hans,
I'm not sure if it would help to use the pre-compiled binaries,
as you would still need some of the underlying libraries for building
R packages. We're not far from having this fixed ... there is a newer revision of R on the main toolshed,
that nevertheless will (probably) fail because of a missing include of what seems to be fontconfig.
I had it working yesterday already, I'm trying to see what went wrong in the meantime ...
Marius