anchor.diff:  
     outputs = [ "out" "dev" ];
   
  -  preCheck = ''
  -    sed -i 's/test_set_default_verify_paths/noop/' tests/test_ssl.py
  -    # https://github.com/pyca/pyopenssl/issues/692
  -    sed -i 's/test_fallback_default_verify_paths/noop/' tests/test_ssl.py
  -  '';
  -
     checkPhase = ''
       runHook preCheck
       export LANG="en_US.UTF-8"
  -    py.test
  +    py.test tests ${testExpression}
       runHook postCheck
     '';
   
  
positive.code: , glibcLocales
  }:
  
  buildPythonPackage rec {
    pname = "pyOpenSSL";
    version = "18.0.0";
  
negative.code:   propagatedBuildInputs = [ cryptography pyasn1 idna ];
  
    checkInputs = [ pytest pretend flaky glibcLocales ];
  }
  