anchor.diff:  let
     # NOTE: When updating, please also update in current stable,
     # as older versions stop working
  -  version = "28.4.14";
  +  version = "29.4.20";
     sha256 =
       {
  -      "x86_64-linux" = "02pfly33bg85c8y3igvkhyshra8ra089ghjibhzl1a4fmd45wf52";
  -      "i686-linux"   = "10swkjbzkyf19cilzw7ja6byla4dllr52pbz19wjzb8rv088gcla";
  +      "x86_64-linux" = "0w8n8q846mqq8f3yisn9xazf323sn579zyp1kwrdrmmqalwiwcl2";
  +      "i686-linux"   = "0zgdnpizgkw2q6wglkdhpzzrhnpplfi2ldcw1z0k9r6slici5mfk";
       }."${stdenv.system}" or (throw "system ${stdenv.system} not supported");
   
     arch =
  
positive.code: 
        qtbase qtdeclarative qtwebkit
      ];
  
    desktopItem = makeDesktopItem {
      name = "dropbox";
  
negative.code:   # relative location where the dropbox libraries are stored
    appdir = "opt/dropbox";
  
    libs =
      [
        dbus_libs fontconfig freetype gcc.cc glib libdrm libffi libICE libSM
        libX11 libXcomposite libXext libXmu libXrender libxcb libxml2 libxslt
  