anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "pktgen";
  -  version = "21.05.0";
  +  version = "21.11.0";
   
     src = fetchFromGitHub {
       owner = "pktgen";
       repo = "Pktgen-DPDK";
       rev = "pktgen-${version}";
  -    sha256 = "sha256-7lLDtbd14olEHO+1BuI6KTEUNRM/zAyRXau/OZbYbGA=";
  +    sha256 = "sha256-3z5DSkggHTwjzsRzRG5zzZTcNsn/5YankJT8CKSN8b4=";
     };
   
     nativeBuildInputs = [ meson ninja pkg-config ];
  
positive.code:     description = "Traffic generator powered by DPDK";
      homepage = "http://dpdk.org/";
      license = licenses.bsdOriginal;
      platforms =  [ "x86_64-linux" ];
      maintainers = [ maintainers.abuibrahim ];
    };
  }
  
negative.code:   RTE_SDK = dpdk;
    GUI = lib.optionalString withGtk "true";
  
    # requires symbols from this file
    NIX_LDFLAGS = "-lrte_net_bond";
  
  