{stdenv, fetchurl, zlib, openssl, libre, librem}:
stdenv.mkDerivation rec {
  version = "0.4.2";
  name = "restund-${version}";
  src=fetchurl {
    url = "http://www.creytiv.com/pub/restund-${version}.tar.gz";
    sha256 = "db5260939d40cb2ce531075bef02b9d6431067bdd52f3168a6f25246bdf7b9f2";
  };
  buildInputs = [zlib openssl libre librem];
  makeFlags = [
    "LIBRE_MK=${libre}/share/re/re.mk"
    "LIBRE_INC=${libre}/include/re"
    "LIBRE_SO=${libre}/lib"
    "LIBREM_PATH=${librem}"
    ''PREFIX=$(out)''
  ]
  ++ stdenv.lib.optional (stdenv.gcc.gcc != null) "SYSROOT_ALT=${stdenv.gcc.gcc}"
  ++ stdenv.lib.optional (stdenv.gcc.libc != null) "SYSROOT=${stdenv.gcc.libc}"
  ;
  meta = {
    homepage = "http://www.creytiv.com/restund.html";
    platforms = with stdenv.lib.platforms; linux;
    maintainers = with stdenv.lib.maintainers; [raskin];
    license = with stdenv.lib.licenses; bsd3;
  };
}