anchor.diff:      owner = "nsnam";
       repo   = "ns-3-dev";
       rev    = "ns-3.${version}";
  -    sha256 = "158yjhsrmslj1q4zcq5p16hv9i82qnxx714l7idicncn0wzrfx7k";
  +    sha256 = "0ds8h0f2qcb0gc2a8bk38cbhdb122i4sbg589bjn59rblzw0hkq4";
     };
   
     nativeBuildInputs = [ wafHook python ];
  
positive.code:     ${pythonEnv.interpreter} ./test.py --nowaf
    '';
  
    # strictoverflow prevents clang from discovering pyembed when bindings
    hardeningDisable = [ "fortify" "strictoverflow"];
  
  
negative.code: { stdenv
  , fetchFromGitLab
  , fetchpatch
  , python
  , wafHook
  
  