{ mkDerivation, base, bytestring, fetchurl }:
mkDerivation {
  pname = "iconv";
  version = "0.4.1.3";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base bytestring ];
  description = "String encoding conversion";
  license = stdenv.lib.licenses.bsd3;
}