anchor.diff:      ${pythonEnv.interpreter} ./test.py --nowaf
     '';
   
  +  patches = [
  +    (fetchpatch {
  +      name = "upstream-issue-336.patch";
  +      url = "https://gitlab.com/nsnam/ns-3-dev/-/commit/673004edae1112e6cb249b698aad856d728530fb.patch";
  +      sha256 = "0q96ividinbh9xlws014b2ir6gaavygnln5ca9m1db06m4vfwhng";
  +    })
  +  ];
  +
     # strictoverflow prevents clang from discovering pyembed when bindings
     hardeningDisable = [ "fortify" "strictoverflow"];
   
  
positive.code:     owner = "nsnam";
      repo   = "ns-3-dev";
      rev    = "ns-3.${version}";
      sha256 = "158yjhsrmslj1q4zcq5p16hv9i82qnxx714l7idicncn0wzrfx7k";
    };
  
    nativeBuildInputs = [ wafHook python ];
  
negative.code: { stdenv
  , fetchFromGitLab
  , fetchpatch
  , python
  , wafHook
  
  