[xmonad] how can I completely re-install ghc/cabal/xmonad ?

[Don Stewart]

lobzang:
> Hi guys,
> 
> It seems that my ghc configuration is broken ( /usr/lib/ghc-6.8.1/package.conf )
> . Is there a way to re-install properly cabal / ghc ?  (or at least find a way
> to fix my conf)
> I would like to make a clean install of xmonad.

You can start by unregistering packages you installed. Then install
cabal, then X11, xmonad et al.

-- Don