[Haskell-cafe] Setting up cabal on EC2

Hi all. I'm having some issues setting up cabal on EC2. I've installed ghc 7.0.2, however, the bootstrap.sh script for cabal-install is complaining about missing dependencies:

Linking Setup ... Configuring Cabal-1.8.0.2... Setup: At least the following dependencies are missing: base >=4 && <3 && >=1 && <5, filepath >=1 && <1.2 Setup: At least the following dependencies are missing: base >=4 && <3 && >=1 && <5, filepath >=1 && <1.2

ghc-pkg tells me that I have base and filepath installed:

/usr/local/lib/ghc-7.0.2/package.conf.d base-4.3.1.0

/usr/local/lib/ghc-7.0.2/package.conf.d filepath-1.2.0.0

Could there be an environment variable I need to set somewhere?