{ mkDerivation, base, fetchurl, semigroupoids }:
mkDerivation {
  pname = "monad-products";
  version = "4.0.1";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base semigroupoids ];
  homepage = "http://github.com/ekmett/monad-products";
  description = "Monad products";
  license = stdenv.lib.licenses.bsd3;
}