{stdenv, fetchurl}:

stdenv.mkDerivation ( {
  name = "gnupatch-2.5.4";
  src = fetchurl {
    url = mirror://gnu/patch/patch-2.5.4.tar.gz;
    md5 = "ee5ae84d115f051d87fcaaef3b4ae782";
  };

  # Hack around ancient configure script: doesn't build on many newer
  # platforms unless a platform is specified.
  configureFlags = "dummy";

  patches = if stdenv.isDarwin then [./setmode.patch] else [];
} // (if stdenv.isDarwin then { ac_cv_exeext = "" ; } else {} ) )