anchor.diff:  in
   stdenv.mkDerivation rec {
     pname = "ns-3";
  -  version = "32";
  +  version = "33";
   
     src = fetchFromGitLab {
       owner = "nsnam";
  
positive.code:     license = licenses.gpl3;
      description = "A discrete time event network simulator";
      platforms = with platforms; unix;
      maintainers = with maintainers; [ teto ];
    };
  }
  
negative.code: 
    postPatch = ''
      patchShebangs doc/ns3_html_theme/get_version.sh
    '';
  
    wafConfigureFlags = with stdenv.lib; [
  