[xmonad] Problem in Installing xmonad

Hello. I'm trying install xmonad (0.4.1). I use debian linux 4.0 r1 I've installed new version of ghc: 6.8.1, version of X11 is 1.3.0. When I configure xmonad (runhaskell Setup.lhs configure) I get error: ------------------- XMonad.hs:42:17: Could not find module `Data.Set': it is a member of package containers-0.1.0.0, which is hidden ------------------- Can anybody help me? P.S. With older version of ghc (from debian distr, I had problem to install old-time and old-locale packages...). P.S.S. I'm novice in haskell. Is there any tutorial how to install (update) new haskell packages (for ghc)?