anchor.diff: -{ lib, stdenv, fetchFromGitHub, fetchpatch
  +{ lib, stdenv, fetchFromGitHub
   , meson, ninja, pkg-config, gettext, libxslt, docbook_xsl_ns
   , libcap, libidn2
   }:
   
  -with lib;
  -
   let
  -  version = "20200821";
  +  version = "20210202";
     sunAsIsLicense = {
       fullName = "AS-IS, SUN MICROSYSTEMS license";
       url = "https://github.com/iputils/iputils/blob/s${version}/rdisc.c";
  
positive.code:     "-DINSTALL_SYSTEMD_UNITS=true"
    ]
      # Disable idn usage w/musl (https://github.com/iputils/iputils/pull/111):
      ++ optional stdenv.hostPlatform.isMusl "-DUSE_IDN=false";
  
    nativeBuildInputs = [ meson ninja pkg-config gettext libxslt.bin docbook_xsl_ns ];
    buildInputs = [ libcap ]
      ++ optional (!stdenv.hostPlatform.isMusl) libidn2;
  
    meta = {
      description = "A set of small useful utilities for Linux networking";
      inherit (src.meta) homepage;
      changelog = "https://github.com/iputils/iputils/releases/tag/s${version}";
  
negative.code:   src = fetchFromGitHub {
      owner = pname;
      repo = pname;
      rev = version;
      sha256 = "08j2hfgnfh31vv9rn1ml7090j2lsvm9wdpdz13rz60rmyzrx9dq3";
    };
  
    mesonFlags = [
      "-DBUILD_RARPD=true"
  