[Haskell-beginners] Question about ghc and cabal: finding packages

[C Gosch]

Hi everyone,
I have installed ghc 6.12.3 and the Haskell platform; now, when I install
packages from hackage using
   cabal install <package-name>,
they get installed in ~/.cabal,
which is fair enough.
However, when I call a
   runhaskell Setup.lhs configure
that used to work on a different computer with the same software setup,
ghc (or is it cabal?) complains that it cannot find the packages I have just
installed.
Checking again revealed that they are indeed installed, just not in the ghc
installation directory,
but under ~/.cabal.
How can I tell cabal and/or ghc where to look for libraries?

Thanks, again, for any help!
Christian
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