[xmonad] XMonad-contrib installation problem

[RCY]

Hi,
 On my Ubuntu 11.10, I installed  xmonad using  'cabal install xmonad'
However 'cabal install xmonad-contrib' failed with the errors shown below.
I have also listed the output from 'ghc-pkg list'. I would appreciate help
in fixing this problem.
Thanks,
Recif


%cabal install xmonad-contrib
Resolving dependencies...
Configuring xmonad-contrib-0.9.2...
Warning: This package indirectly depends on multiple versions of the same
package. This is highly likely to cause a compile failure.
package process-1.0.1.5 requires directory-1.1.0.0
package haskell98-1.1.0.1 requires directory-1.1.0.0
package xmonad-contrib-0.9.2 requires directory-1.1.0.0
package xmonad-0.9.2 requires directory-1.1.0.0
package process-1.0.1.5 requires directory-1.1.0.0
package haskell98-1.1.0.1 requires process-1.0.1.5
package xmonad-contrib-0.9.2 requires process-1.0.1.5
package xmonad-0.9.2 requires process-1.0.1.5
package process-1.0.1.5 requires unix-2.4.2.0
package directory-1.1.0.0 requires unix-2.4.2.0
package xmonad-contrib-0.9.2 requires unix-2.5.0.0
package xmonad-0.9.2 requires unix-2.5.0.0
package process-1.0.1.5 requires unix-2.5.0.0
package directory-1.1.0.0 requires unix-2.5.0.0
Preprocessing library xmonad-contrib-0.9.2...
Building xmonad-contrib-0.9.2...
<command line>: cannot satisfy -package-id
directory-1.1.0.0-ec90bcfb4e24c74a65b384bc1d58afa8:
    directory-1.1.0.0-ec90bcfb4e24c74a65b384bc1d58afa8 is shadowed by
package directory-1.1.0.0-393d8e95f1c0dd6ee908e122f924ac85
    (use -v for more information)
cabal: Error: some packages failed to install:
xmonad-contrib-0.9.2 failed during the building phase. The exception was:
ExitFailure 1







%ghc-pkg list
/var/lib/ghc-7.0.3/package.conf.d
   Cabal-1.10.1.0
   X11-1.5.0.0
   X11-xft-0.3
   array-0.3.0.2
   base-4.3.1.0
   bin-package-db-0.0.0.0
   bytestring-0.9.1.10
   containers-0.4.0.0
   directory-1.1.0.0
   extensible-exceptions-0.1.1.2
   filepath-1.2.0.0
   ghc-7.0.3
   ghc-binary-0.5.0.2
   ghc-prim-0.2.0.0
   haskell2010-1.0.0.0
   haskell98-1.1.0.1
   hpc-0.5.0.6
   integer-gmp-0.2.0.3
   mtl-2.0.1.0
   old-locale-1.0.0.2
   old-time-1.0.0.6
   pretty-1.0.1.2
   process-1.0.1.5
   random-1.0.0.3
   rts-1.0
   syb-0.3
   template-haskell-2.5.0.0
   time-1.2.0.3
   transformers-0.2.2.0
   unix-2.4.2.0
   utf8-string-0.3.6
   xmonad-0.9.2
   xmonad-contrib-0.9.2
/home/rc/.ghc/x86_64-linux-7.0.3/package.conf.d
   directory-1.1.0.0
   process-1.0.1.5
   strict-0.3.2
   unix-2.5.0.0
   xdg-basedir-0.2.1
   xmonad-0.9.2
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