anchor.diff:        else
           "8"
       }"
  -    "--chroma-format=${chroma}"
  +    "--chroma-format=all"
  +    "--enable-asm"
  +    "--disable-debug"
  +    "--disable-gprof"
       "--enable-pic"
       "--disable-avs"
       "--disable-swscale"
  
positive.code:   '';
  
    configureFlags = [
      "--enable-shared"
      "--disable-interlaced"
      "--bit-depth=${
        if (enable10bit) then
  
negative.code: , yasm
  
  , enable10bit ? false
  }:
  
  stdenv.mkDerivation rec {
    name = "x264-${version}";
    version = "20160613";
  
    src = fetchurl {
      url = "https://ftp.videolan.org/pub/videolan/x264/snapshots/"
        + "x264-snapshot-${version}-2245-stable.tar.bz2";
      sha256 = "de1dd21e73f565d9cd8b0a7e3e3aaf3e50b41f5ed475b7958132ef0156c9f8b7";
    };
  
    nativeBuildInputs = [
  