[Xmonad] Darcs version on Debian etch?

I'm trying to compile the most recent darcs version on Debian etch, but it requires a new X11-extras, and that complains that X11 is too old (etch has X11-1.2, X11-extras requires X11-1.2.1). What is an easy way to get the new xmonad compiled on Debian? I found http://haskell-unsafe.alioth.debian.org/haskell-unsafe.html but that seems to think that stable == woody, so I am reluctant to rely on it. tia, Kai