[xmonad] can't configure xmonad with the latest GHC

[Don Stewart]

valery.vv:
> Houston, I've got a problem.
> 
> Having the latest GHC from darcs installed, I cannot configure xmonad
> any more.
> 
> vvv at fun:~/src/xmonad$ runhaskell Setup.lhs clean
> cleaning...
> 
> vvv at fun:~/src/xmonad$ runhaskell Setup.lhs configure --user --prefix=$HOME
> Configuring xmonad-0.4...
> Setup.lhs: At least the following dependencies are missing:
>     base <3, unix -any
> 
> vvv at fun:~/src/xmonad$ runhaskell Setup.lhs configure --prefix=$HOME
> Configuring xmonad-0.4...
> Setup.lhs: At least the following dependencies are missing:
>     X11 ==1.4.0, mtl -any
> 
> The dependencies are actually there, AFAIU:
> 
> vvv at fun:~/src/xmonad$ ghc-pkg list
> /home/vvv/lib/ghc-6.9.20071125/package.conf:
>     Cabal-1.3, array-0.1, base-3.0, bytestring-0.9, containers-0.1,
>     directory-1.0, filepath-1.1, (ghc-6.9.20071125), haskell98-1.0.1,
>     hpc-0.5, old-locale-1.0, old-time-1.0, packedstring-0.1,
>     pretty-1.0, process-1.0, random-1.0, readline-1.0.1, rts-1.0,
>     template-haskell-2.2, unix-2.2
> /home/vvv/.ghc/i386-linux-6.9.20071125/package.conf:
>     X11-1.4.0, mtl-1.1.0.0
> 
> A hint is highly welcome. ;)
> 

GHC from darcs is only supported by xmonad from darcs,

-- Don