anchor.diff:  
     enableParallelBuilding = true;
   
  -  /*
  -  # some libs fail to link to liblzma and/or libffi
  -  postFixup = let extraLibs = stdenv.lib.makeLibraryPath [ xz.out libffi.out zlib.out ];
  -    in ''
  -      for f in "$out"/lib/*.so.0.*; do
  -        patchelf --set-rpath `patchelf --print-rpath "$f"`':${extraLibs}' "$f"
  -      done
  -    '';
  -  */
  -
     # The interface version prevents NixOS from switching to an
     # incompatible systemd at runtime.  (Switching across reboots is
     # fine, of course.)  It should be increased whenever systemd changes
  
positive.code:         --replace /usr/lib/systemd/catalog/ $out/lib/systemd/catalog/
  
        configureFlagsArray+=("--with-ntp-servers=0.nixos.pool.ntp.org 1.nixos.pool.ntp.org 2.nixos.pool.ntp.org 3.nixos.pool.ntp.org")
  
        #export NIX_CFLAGS_LINK+=" -Wl,-rpath,$libudev/lib"
      '';
  
    PYTHON_BINARY = "${coreutils}/bin/env python"; # don't want a build time dependency on Python
  
negative.code: assert stdenv.isLinux;
  
  stdenv.mkDerivation rec {
    version = "234";
    name = "systemd-${version}";
  
    src = fetchFromGitHub {
      owner = "nixos";
      repo = "systemd";
      rev = "ba777535a890c2a2b7677dfacc63e12c578b9b3f";
      sha256 = "1cj20zrfr8g0vkxiv3h9bbd89xbj3mrsij3rja1lbh4nkl5mcwpa";
    };
  
    outputs = [ "out" "lib" "man" "dev" ];
  