anchor.diff:  { lib, stdenv, fetchFromGitHub
   , meson, ninja, pkg-config, gettext, libxslt, docbook_xsl_ns
   , libcap, libidn2
  +, iproute2
   , apparmorRulesFromClosure
   }:
   
   let
  -  version = "20210202";
  +  version = "20210722";
     sunAsIsLicense = {
       fullName = "AS-IS, SUN MICROSYSTEMS license";
       url = "https://github.com/iputils/iputils/blob/s${version}/rdisc.c";
  
positive.code:     owner = pname;
      repo = pname;
      rev = version;
      sha256 = "08j2hfgnfh31vv9rn1ml7090j2lsvm9wdpdz13rz60rmyzrx9dq3";
    };
  
    outputs = ["out" "apparmor"];
  
    mesonFlags = [
      "-DBUILD_RARPD=true"
  
negative.code:   nativeBuildInputs = [ meson ninja pkg-config gettext libxslt.bin docbook_xsl_ns ];
    buildInputs = [ libcap ]
      ++ lib.optional (!stdenv.hostPlatform.isMusl) libidn2;
    checkInputs = [ iproute2 ];
  
    postInstall = ''
      mkdir $apparmor
      cat >$apparmor/bin.ping <<EOF
  