anchor.diff:  # Derivation patches HandBrake to use Nix closure dependencies.
   #
   
  -{ stdenv, lib, fetchurl,
  -  python2, pkgconfig, autoconf, automake, cmake, yasm, libtool, m4,
  -  fribidi, fontconfig, freetype, jansson, zlib,
  -  libass, libiconv, libsamplerate, libxml2, bzip2,
  -  ffmpeg_4, libtheora, x264, x265, libvpx, mpeg2dec,
  -  libopus, lame, libvorbis, a52dec,
  -  libogg, libmkv, mp4v2,
  +{ stdenv, lib, fetchurl, callPackage,
  +  # Main build tools
  +  python2, pkgconfig, autoconf, automake, cmake, nasm, libtool, m4,
  +  # Processing, video codecs, containers
  +  ffmpeg_4, libogg, x264, x265, libvpx, libtheora,
  +  # Codecs, audio
  +  libopus, lame, libvorbis, a52dec, speex, libsamplerate,
  +  # Text processing
  +  libiconv, fribidi, fontconfig, freetype, libass, jansson, libxml2,
  +  # Optical media
     libdvdread, libdvdnav, libdvdcss, libbluray,
     useGtk ? true, wrapGAppsHook ? null,
                    intltool ? null,
  
positive.code:   };
  
    nativeBuildInputs = [
      python2 pkgconfig autoconf automake cmake yasm libtool m4
    ] ++ lib.optionals useGtk [ intltool wrapGAppsHook ];
  
    buildInputs = [
      fribidi fontconfig freetype jansson zlib
      libass libiconv libsamplerate libxml2 bzip2
      ffmpeg_4 libtheora x264 x265 libvpx mpeg2dec
      libopus lame libvorbis a52dec
      libogg libmkv mp4v2
      libdvdread libdvdnav libdvdcss libbluray
    ] ++ lib.optionals useGtk [
      glib gtk3 libappindicator-gtk3 libnotify
      gst_all_1.gstreamer gst_all_1.gst-plugins-base dbus-glib udev
      libgudev hicolor-icon-theme
    ] ++ lib.optional useFdk fdk_aac;
  
    # NOTE: 2018-12-25: v1.2.0 now requires cmake dep
    # (default distribution bundles&builds 3rd party libs),
  
negative.code:   useFdk ? false, fdk_aac ? null
  }:
  
  let
  
    nv-codec-headers = callPackage ../../../development/libraries/ffmpeg-full/nv-codec-headers.nix { };
  
  in
  
  stdenv.mkDerivation rec {
    version = "1.2.0";
    name = "handbrake-${version}";
  