Build errors

[guest]

A suitable c2hs version is available on Hackage, but Cabal doesn't see it when it tries to install CV.

$ cabal install CV
...
cabal: The program c2hs version >=0.16.0 is required but it could not be found.

Even after manually installing c2hs version 0.16.3, CV still doesn't see it.

$ cabal install c2hs
$ cabal install CV
...
cabal: The program c2hs version >=0.16.0 is required but it could not be found.

Specs:

Mac OS X 10.7.3

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.0.3
$ cabal --version
cabal-install version 0.10.2
using version 1.10.1.0 of the Cabal library