[Haskell-cafe] Again, version conflicting problem with cabal-install

[Magicloud Magiclouds]

Hello,
  As I recalled, ghc works in staticly link mode. So after one library
is compiled, all its build dependencies are useless. Lost, changed,
wheresoever, it does not matter.
  Then why the problem of version conflicting exists?
  By version conflicting I mean like following. This way, A is not
installable by cabal.
A needs B 0.1
A needs C 0.1
B needs C0.2
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