anchor.diff:  
   let
     mod = kernel != null;
  -
  +  dpdkVersion = "21.02";
   in stdenv.mkDerivation rec {
  -  name = "dpdk-${version}" + lib.optionalString mod "-${kernel.version}";
  -  version = "20.05";
  +  pname = "dpdk";
  +  version = "${dpdkVersion}" + lib.optionalString mod "-${kernel.version}";
   
     src = fetchurl {
  -    url = "https://fast.dpdk.org/rel/dpdk-${version}.tar.xz";
  -    sha256 = "0h0xv2zwb91b9n29afg5ihn06a8q28in64hag2f112kc19f79jj8";
  +    url = "https://fast.dpdk.org/rel/dpdk-${dpdkVersion}.tar.xz";
  +    sha256 = "sha256-CZJKKoJVGqKZeKNoYYT4oQX1L1ZAsb4of1QLLJHpSJs==";
     };
   
     nativeBuildInputs = [
  
positive.code:   '';
  
    mesonFlags = [
      "-Denable_docs=true"
      "-Denable_kmods=${lib.boolToString mod}"
    ]
    ++ lib.optional (!shared) "-Ddefault_library=static"
    ++ lib.optional stdenv.isx86_64 "-Dmachine=nehalem"
    ++ lib.optional mod "-Dkernel_dir=${placeholder "kmod"}/lib/modules/${kernel.modDirVersion}";
  
negative.code:     pkg-config
      python3
      python3.pkgs.sphinx
      python3.pkgs.pyelftools
    ];
    buildInputs = [
      jansson
  