anchor.diff:  # Derivation patches HandBrake to use our closure.
   #
   
  -# TODO: Release 1.2.0 would switch LibAV to FFmpeg.
  -
   { stdenv, lib, fetchurl,
     python2, pkgconfig, yasm, harfbuzz, zlib,
  -  autoconf, automake, cmake, libtool, m4, jansson,
  +  autoconf, automake, libtool, m4, jansson,
     libass, libiconv, libsamplerate, fribidi, libxml2, bzip2,
     libogg, libopus, libtheora, libvorbis, libdvdcss, a52dec,
     lame, libdvdread, libdvdnav, libbluray,
  
positive.code:   });
  
    nativeBuildInputs = [
      cmake python2 pkgconfig yasm autoconf automake libtool m4
    ] ++ lib.optionals useGtk [ intltool wrapGAppsHook ];
  
    buildInputs = [
  
negative.code:     libgudev
    ] ++ (if useFfmpeg then [ ffmpeg ] else [ patched_libav_12 ])
    ++ lib.optional useFdk fdk_aac;
  
    enableParallelBuilding = true;
  
  