anchor.diff:  , bzip2, flac, speex, icu, libopus
   , libevent, expat, libjpeg, snappy
   , libpng, libxml2, libxslt, v8
  -, xdg_utils, yasm, zlib, libwebp
  +, xdg_utils, yasm, minizip, libwebp
   , libusb1, libexif, pciutils
   
   , python, pythonPackages, perl, pkgconfig
  
positive.code:     use_system_stlport = true;
      use_system_xdg_utils = true;
      use_system_yasm = true;
      use_system_zlib = false; # http://crbug.com/143623
      use_system_protobuf = true;
  
      use_system_harfbuzz = false;
  
negative.code:     bzip2 flac speex icu libopus
      libevent expat libjpeg snappy
      libpng libxml2 libxslt v8
      xdg_utils yasm minizip libwebp
      libusb1 libexif
    ];
  
  