anchor.diff:  { stdenv, fetchurl, makeWrapper, ninja, which
   
   # default dependencies
  -, bzip2, flac, speex
  -, libevent, expat, libjpeg
  +, bzip2, flac, speex, icu, libopus
  +, libevent, expat, libjpeg, snappy
   , libpng, libxml2, libxslt
   , xdg_utils, yasm, zlib
   , libusb1, libexif, pciutils
  
positive.code:   };
  
    defaultDependencies = [
      bzip2 flac speex
      libevent expat libjpeg
      libpng libxml2 libxslt
      xdg_utils yasm zlib
      libusb1 libexif
  
negative.code:   });
  
    configurePhase = ''
      python build/linux/unbundle/replace_gyp_files.py ${gypFlags}
      python build/gyp_chromium -f ninja --depth "$(pwd)" ${gypFlags}
    '';
  
  