anchor.diff:  { stdenv, fetchurl, pkgconfig, libnfnetlink, libmnl }:
   
  +let version = "1.0.5"; in
   stdenv.mkDerivation rec {
  -  name = "libnetfilter_conntrack-1.0.4";
  +  name = "libnetfilter_conntrack-${version}";
   
     src = fetchurl {
       url = "http://netfilter.org/projects/libnetfilter_conntrack/files/${name}.tar.bz2";
  
positive.code:   nativeBuildInputs = [ pkgconfig ];
  
    meta = with stdenv.lib; {
      description = "Userspace library providing an API to the in-kernel connection tracking state table";
      longDescription = ''
        libnetfilter_conntrack is a userspace library providing a programming interface (API) to the
  
negative.code:     '';
      homepage = http://netfilter.org/projects/libnetfilter_conntrack/;
      license = licenses.gpl2Plus;
      platforms = platforms.linux;
      maintainers = with maintainers; [ nckx ];
    };
  