Just by looking at the hackage dependencies, it doesn't look like it has unix-only dependencies. Maybe the Boehm garbage collector?
Has anyone played with Idris (http://idris-lang.org/) at all? It looks interesting, and I'd love to play with it, but unfortunately I only have windows machines up and running at the moment and the documentation seems to imply it only builds on unixy systems.
I'm curious how difficult it would be to get a win32 implementation up and running.
-- ryan