anchor.diff:    name = "dropbox-${version}-bin";
     src = fetchurl {
       name = "dropbox-${version}.tar.gz";
  -    
       url = "https://dl-web.dropbox.com/u/17/dropbox-lnx.${arch}-${version}.tar.gz";
       inherit sha256;
     };
  
positive.code: { stdenv, fetchurl, makeDesktopItem
  , dbus_libs, gcc, glib, libdrm, libffi, libICE, librsync, libSM
  , libX11, libXmu, mesa, ncurses, popt, qt5, zlib
  }:
  
  # this package contains the daemon version of dropbox
  
negative.code:   ldpath = stdenv.lib.makeSearchPath "lib"
      [
        dbus_libs gcc glib libdrm libffi libICE librsync libSM libX11
        libXmu ncurses popt qt5.base qt5.declarative qt5.webkit
        zlib
      ];
  
  