anchor.diff:      use_openssl = config.useOpenSSL;
       selinux = config.useSELinux;
       use_cups = config.enableCUPS;
  +  } // stdenv.lib.optionalAttrs config.useProprietaryCodecs {
  +    # enable support for the H.264 codec
  +    proprietary_codecs = true;
  +    ffmpeg_branding = "Chrome";
     } // stdenv.lib.optionalAttrs (stdenv.system == "x86_64-linux") {
       target_arch = "x64";
     } // stdenv.lib.optionalAttrs (stdenv.system == "i686-linux") {
  
positive.code:     useOpenSSL = true;
      enableGnomeSupport = false;
      gnomeKeyringSupport = false;
      useProprietaryCodecs = false;
      enableCUPS = false;
    };
  
  
negative.code:   };
  
    defaultDependencies = [
      bzip2 flac # harfbuzz
      icu libevent expat libjpeg
      libpng libwebp libxml2 libxslt # skia
      speex sqlite # stlport
  