anchor.diff:      sha1 = "403da9dd65662e5c4dd34299214e04cb6f80575e";
     };
   
  +  
     commonConfigureFlags =
       [ "--enable-optimize"
         "--disable-debug"
  
positive.code:     buildInputs =
        [ pkgconfig gtk perl zip libIDL libjpeg zlib cairo bzip2 python
          dbus dbus_glib pango freetype fontconfig alsaLib nspr libnotify
          xlibs.pixman libvpx yasm mesa wirelesstools
        ];
  
      propagatedBuildInputs = [xulrunner];
  
negative.code:       "--with-system-zlib"
        "--with-system-bz2"
        "--with-system-nspr"
        # "--with-system-nss"
        # "--with-system-png" # <-- "--with-system-png won't work because the system's libpng doesn't have APNG support"
        "--enable-system-cairo"
        # Compiling with the Nixpkgs SQLite gives:
        # "configure: error: System SQLite library is not compiled with SQLITE_SECURE_DELETE."
        # "--enable-system-sqlite"
        "--disable-crashreporter"
        "--disable-tests"
        "--disable-necko-wifi" # maybe we want to enable this at some point
        "--disable-installer" 
        "--disable-updater"
      ];
  
  
  