anchor.diff:      sha256 = "1bqf1f5glwf285sa98k5pkj9gg79lliixk1jk85j63v5510fbagp";
     };
   
  -  outputs = [ "bin" "dev" "out" "man" ];
  +  outputs = [ "bin" "dev" "out" "man" ] ++ lib.optional pythonSupport "py";
   
     patches = stdenv.lib.optional stdenv.hostPlatform.isMusl
       (fetchpatch {
  
positive.code: 
    enableParallelBuilding = true;
  
    nativeBuildInputs = [ autoreconfHook bison flex pkgconfig ];
  
    meta = with lib; {
      inherit version;
  
negative.code: { stdenv, file, lib, fetchFromGitHub, fetchpatch, autoreconfHook, bison, flex, pkgconfig
  , pythonSupport ? true, swig ? null, python}:
  
  stdenv.mkDerivation rec {
    name = "libnl-${version}";
  