Hi,
  I am having ghc 7.6.1 working here. But anytime I installed something with cabal-install, I got prompts like:

Warning: The following packages are likely to be broken by the reinstalls:
haskell98-2.0.0.2
ghc-7.6.1
Cabal-1.16.0
bin-package-db-0.0.0.0
directory-1.2.0.0
hpc-0.6.0.0
Continuing even though the plan contains dangerous reinstalls.

  And even worse, then I got:

<command line>: cannot satisfy -package Cabal-1.16.0: 
    Cabal-1.16.0-dd0ce1db6fea670a788547ee85411486 is unusable due to missing or recursive dependencies:
      directory-1.2.0.0-8edf300597b0da609c8eccc9aa6d0cc3 process-1.1.0.2-03ae5757aa509ffbe497f42660cba52c unix-2.6.0.0-4bc27fc415f60036a88211de7cde3e9a
    (use -v for more information)

  What should I do? Why user space directory and process would interrupt Cabal in global space?
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