anchor.diff:  , python
   , pytest
   , pycparser
  +, psutil
   , pkgconfig
   , dotnetbuildhelpers
   , clang
  
positive.code:     dotnetbuildhelpers
      clang
  
      NUnit360
      UnmanagedExports127
    ];
  
    buildInputs = [
      mono
    ];
  
    preBuild = ''
      rm -rf packages
      mkdir packages
  
      ln -s ${NUnit360}/lib/dotnet/NUnit/ packages/NUnit.3.6.0
      ln -s ${UnmanagedExports127}/lib/dotnet/NUnit/ packages/UnmanagedExports.1.2.7
    '';
  
    checkPhase = ''
  
negative.code: 
  buildPythonPackage rec {
    pname = "pythonnet";
    version = "2.4.0";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "1ach9jic7a9rd3vmc4bphkr9fq01a0qk81f8a7gr9npwzmkqx8x3";
    };
  
    postPatch = ''
  