Requirements for using and for building
The Glasgow Haskell Compiler. It works with GHC-7.4.1, and should also work with later versions. It might work with GHC-7.2, but does not work with GHC-7.0.4 or older.
A Unix like system. HsShellScript is being developed and tested on Linux.
Requirements only for building
GHC and Haddock are included in the The Haskell Platform, c2hs isn't.