anchor.diff:  { stdenv, fetchurl, fetchpatch, lib, pkgconfig, utillinux, libcap, libtirpc, libevent
   , sqlite, kerberos, kmod, libuuid, keyutils, lvm2, systemd, coreutils, tcp_wrappers
  -, python3, buildPackages, nixosTests
  +, python3, buildPackages, nixosTests, rpcsvc-proto
   , enablePython ? true
   }:
   
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "nfs-utils";
    version = "2.4.1";
  
    src = fetchurl {
      url = "https://kernel.org/pub/linux/utils/nfs-utils/${version}/${pname}-${version}.tar.xz";
      sha256 = "0dkp11a7i01c378ri68bf6k56z27kz8zzvpqm7mip6s7jkd4l9w5";
    };
  
    # libnfsidmap is built together with nfs-utils from the same source,
    # put it in the "lib" output, and the headers in "dev"
    outputs = [ "out" "dev" "lib" "man" ];
  
    nativeBuildInputs = [ pkgconfig buildPackages.stdenv.cc ];
  
    buildInputs = [
      libtirpc libcap libevent sqlite lvm2
  
negative.code:       "--with-systemd=${placeholder "out"}/etc/systemd/system"
        "--enable-libmount-mount"
        "--with-pluginpath=${placeholder "lib"}/lib/libnfsidmap" # this installs libnfsidmap
        "--with-rpcgen=${rpcsvc-proto}/bin/rpcgen"
      ];
  
    patches = lib.optionals stdenv.hostPlatform.isMusl [
      (fetchpatch {
  