anchor.diff:  { stdenv, fetchurl, libpcap,/* gnutls, libgcrypt,*/ libxml2, glib
   , geoip, geolite-legacy, sqlite, which, autoreconfHook, git
  -, pkgconfig, groff, curl, json_c
  +, pkgconfig, groff, curl, json_c, luajit, zeromq, rrdtool
   }:
   
   # ntopng includes LuaJIT, mongoose, rrdtool and zeromq in its third-party/
  -# directory.
  +# directory, but we use luajit, zeromq, and rrdtool from nixpkgs
   
   stdenv.mkDerivation rec {
     name = "ntopng-2.0";
  
positive.code: 
      rm -rf httpdocs/geoip
      ln -s ${geolite-legacy}/share/GeoIP httpdocs/geoip
    '';
  
    meta = with stdenv.lib; {
      description = "High-speed web-based traffic analysis and flow collection tool";
      homepage = http://www.ntop.org/products/ntop/;
      license = licenses.gpl3Plus;
      platforms = platforms.linux;
      maintainers = [ maintainers.bjornfor ];
    };
  }
  
negative.code:   ];
  
    buildInputs = [ libpcap/* gnutls libgcrypt*/ libxml2 glib geoip geolite-legacy
      sqlite which autoreconfHook git pkgconfig groff curl json_c luajit zeromq
      rrdtool ];
  
  
    autoreconfPhase = ''
  