{ mkDerivation, base, fetchurl }:
mkDerivation {
  pname = "prelude-safeenum";
  version = "0.1.1.2";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base ];
  homepage = "http://code.haskell.org/~wren/";
  description = "A redefinition of the Prelude's Enum class in order to render it safe";
  license = stdenv.lib.licenses.bsd3;
}