anchor.diff:        "--with-system-zlib"
         "--with-system-bz2"
         "--with-system-nspr"
  -      # "--with-system-nss" # Too old in nixpkgs
  +      "--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" # disabled for the moment because our Cairo is too old
  +      # "--enable-system-cairo" # <-- doesn't build
         "--enable-system-sqlite"
         "--disable-crashreporter"
         "--disable-tests"
  
positive.code: 
      buildInputs =
        [ pkgconfig gtk perl zip libIDL libjpeg zlib cairo bzip2 python
          dbus dbus_glib pango freetype fontconfig alsaLib nspr libnotify
          xlibs.pixman yasm mesa sqlite file unzip pysqlite
        ];
  
  
negative.code:       [ pkgconfig gtk perl zip libIDL libjpeg libpng zlib cairo bzip2
          python dbus dbus_glib pango freetype fontconfig xlibs.libXi
          xlibs.libX11 xlibs.libXrender xlibs.libXft xlibs.libXt file
          alsaLib nspr nss libnotify xlibs.pixman yasm mesa
          xlibs.libXScrnSaver xlibs.scrnsaverproto pysqlite
          xlibs.libXext xlibs.xextproto sqlite unzip makeWrapper
        ];
  