[Xmonad] Problem while building Xmonad

[Santanu Chatterjee]

Hello everybody,

I was trying to build xmonad and stumbled upon a problem.
I have already installed X11-1.3.0 and X11-extras-0.4. It seems
that they both expose a module 'Graphics.X11.Xlib.Extras'.
As a result of this, while trying to build xmonad, I get:
----------------------------------------------------------------
santanu at sc214:~/Desktop/xmonad/xmonad-0.4$ runhaskell Setup.lhs build
Preprocessing executables for xmonad-0.4...
Building xmonad-0.4...
XMonad.hs:38:7:
    Could not find module `Graphics.X11.Xlib.Extras':
      it was found in multiple packages: X11-extras-0.4 X11-1.3.0

santanu at sc214:~/Desktop/xmonad/xmonad-0.4$ ghc-pkg list
/usr/lib/ghc-6.6/package.conf:
    Cabal-1.1.3, Cabal-1.1.6, X11-1.3.0, X11-extras-0.4, base-2.0,
    filepath-1.0, (ghc-6.6), haskell98-1.0, mtl-1.0, parsec-2.0,
    readline-1.0, regex-base-0.71, regex-compat-0.71, regex-posix-0.71,
    rts-1.0, stm-2.0, template-haskell-2.0, unix-1.0, unix-2.0
-----------------------------------------------------------------

How do I solve this problem? (I am completely new to haskell. So
I apologize in advance if this is too trivial a question).

By the way, I also tried to unregister X11-1.3.0 and installed X1-1.2.3
(since it does not seem to expose the module in question) and tried
again. But that did not work either.

Thanks in advance for your help.

Regards,
Santanu Chatterjee