[Haskell-cafe] need help for cabal-install

Hi, I just got cabal-install working. However, I have a problem using it. My GHC is installed in a user-specific location, so when I do the Cabal dance, I have to specfiy "Setup configure --prefix=$HOME/ghc". Now with "cabal install", I can not figure out where to specify the --prefix. Cabal always complains "failed to install package". Help is appreciated. Steve