anchor.diff:      requests
       ujson
       uvicorn
  -  ];
  +  ] ++ stdenv.lib.optional stdenv.isDarwin [ darwin.apple_sdk.frameworks.ApplicationServices ];
   
     checkPhase = ''
       ${python.interpreter} -c """
  
positive.code: { lib
  , buildPythonPackage
  , fetchPypi
  , aiofiles
  
negative.code: , python
  , uvicorn
  , isPy27
  , darwin
  }:
  
  buildPythonPackage rec {
  