{ mkDerivation, base, bytestring, fetchurl, hexpat, hxt }:
mkDerivation {
  pname = "hxt-expat";
  version = "9.1.1";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base bytestring hexpat hxt ];
  homepage = "http://www.fh-wedel.de/~si/HXmlToolbox/index.html";
  description = "Expat parser for HXT";
  license = "unknown";
}