anchor.diff:    });
   
     nativeBuildInputs = [
  -    cmake python2 pkgconfig yasm autoconf automake libtool m4
  +    python2 pkgconfig yasm autoconf automake libtool m4
     ] ++ lib.optionals useGtk [ intltool wrapGAppsHook ];
   
     buildInputs = [
  
positive.code: # 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,
    libass, libiconv, libsamplerate, fribidi, libxml2, bzip2,
    libogg, libopus, libtheora, libvorbis, libdvdcss, a52dec,
    lame, libdvdread, libdvdnav, libbluray,
  
negative.code:     libgudev
    ] ++ (if useFfmpeg then [ ffmpeg ] else [ patched_libav_12 ])
    ++ lib.optional useFdk fdk_aac;
  
    enableParallelBuilding = true;
  
  