anchor.diff:          "8"
       }"
       "--chroma-format=${chroma}"
  -    "--enable-asm"
  -    "--disable-debug"
  -    "--disable-gprof"
       "--enable-pic"
       "--disable-avs"
       "--disable-swscale"
  
positive.code: 
  stdenv.mkDerivation rec {
    name = "x264-${version}";
    version = "20160119";
  
    src = fetchurl {
      url = "http://ftp.videolan.org/pub/videolan/x264/snapshots/" +
            "x264-snapshot-${version}-2245-stable.tar.bz2";
      sha256 = "1m7gncijx5wpsgrallmam8zl0sshx3di6svv0kj8rnp3wydn8q98";
    };
  
    nativeBuildInputs = [
  
negative.code:   '';
  
    configureFlags = [
      "--enable-shared"
      "--disable-interlaced"
      "--bit-depth=${
        if (enable10bit) then
  