anchor.diff:    ldpath = stdenv.lib.makeSearchPath "lib"
       [
         dbus_libs gcc glib libdrm libffi libICE librsync libSM libX11
  -      libXmu mesa ncurses popt qt5.base qt5.declarative qt5.webkit
  +      libXmu ncurses popt qt5.base qt5.declarative qt5.webkit
         zlib
       ];
   
  
positive.code:   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;
    };
  
negative.code: { stdenv, fetchurl, makeDesktopItem
  , dbus_libs, gcc, glib, libdrm, libffi, libICE, librsync, libSM
  , libX11, libXmu, ncurses, popt, qt5, zlib
  }:
  
  # this package contains the daemon version of dropbox
  