[Haskell-cafe] Linker errors when using the Hipmunk library

[Stephen Tetley]

Hipmunk is a bit of an oddity in that the Hackage package bundles the
original C library along with Haskell binding.

The first step would be to check that the C library has been built
properly - the build type in the cabal file is "Simple" but I don't
know if this would cause the C lib to be built during a Cabal install.