{cabal}:

cabal.mkDerivation (self : {
  pname = "mtl";
  version = "1.1.0.2"; # Haskell Platform 2009.0.0
  sha256 = "a225aaf2b1e337f40c31e5c42f95eec9a4608322b0e4c135d2b31b8421a58d36";
  meta = {
    description = "Monad transformer library";
  };
})