anchor.diff:  
   stdenv.mkDerivation rec {
     name = "ntopng-1.2.1";
  -
  -  geoLiteCity = fetchurl {
  -    url = "http://geolite.maxmind.com/download/geoip/database/GeoLiteCity.dat.gz";
  -    sha256 = "1xqjyz9xnga3dvhj0f38hf78wv781jflvqkxm6qni3sj781nfr4a";
  -  };
  -
  -  geoLiteCityV6 = fetchurl {
  -    url = "http://geolite.maxmind.com/download/geoip/database/GeoLiteCityv6-beta/GeoLiteCityv6.dat.gz";
  -    sha256 = "03s41ffc5a13qy5kgx8jqya97jkw2qlvdkak98hab7xs0i17z9pd";
  -  };
  -
  -  geoIPASNum = fetchurl {
  -    url = "http://geolite.maxmind.com/download/geoip/database/asnum/GeoIPASNum.dat.gz";
  -    sha256 = "1h766l8dsfgzlrz0q76877xksaf5qf91nwnkqwb6zl1gkczbwy6p";
  -  };
  -
  -  geoIPASNumV6 = fetchurl {
  -    url = "http://geolite.maxmind.com/download/geoip/database/asnum/GeoIPASNumv6.dat.gz";
  -    sha256 = "0dwi9b3amfpmpkknf9ipz2r8aq05gn1j2zlvanwwah3ib5cgva9d";
  -  };
   
     src = fetchurl {
       url = "mirror://sourceforge/project/ntop/ntopng/${name}.tgz";
  
positive.code:         -e "s|\(#define CONST_DEFAULT_INSTALL_DIR\).*|\1 \"$out/share/ntopng\"|g" \
          -i ntop_defines.h
  
      gunzip -c $geoLiteCity > httpdocs/geoip/GeoLiteCity.dat
      gunzip -c $geoLiteCityV6 > httpdocs/geoip/GeoLiteCityv6.dat
      gunzip -c $geoIPASNum > httpdocs/geoip/GeoIPASNum.dat
      gunzip -c $geoIPASNumV6 > httpdocs/geoip/GeoIPASNumv6.dat
    '';
  
    meta = with stdenv.lib; {
  
negative.code: { stdenv, fetchurl, libpcap, gnutls, libgcrypt, libxml2, glib
  , geoip, geolite-legacy, sqlite, which, autoreconfHook, subversion
  , pkgconfig, groff
  }:
  
  # ntopng includes LuaJIT, mongoose, rrdtool and zeromq in its third-party/
  