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:   propagatedBuildInputs = [ cryptography pyasn1 idna ];
  
    checkInputs = [ pytest pretend flaky glibcLocales ];
  }
negative.code: , glibcLocales
  }:
  
  with stdenv.lib;
  
  
  let
    # https://github.com/pyca/pyopenssl/issues/791
    # These tests, we disable in the case that libressl is passed in as openssl.
    failingLibresslTests = [
      "test_op_no_compression"
      "test_npn_advertise_error"
      "test_npn_select_error"
      "test_npn_client_fail"
      "test_npn_success"
      "test_use_certificate_chain_file_unicode"
      "test_use_certificate_chain_file_bytes"
      "test_add_extra_chain_cert"
      "test_set_session_id_fail"
      "test_verify_with_revoked"
      "test_set_notAfter"
      "test_set_notBefore"
    ];
  
    disabledTests = [
      # https://github.com/pyca/pyopenssl/issues/692
      # These tests, we disable always.
      "test_set_default_verify_paths"
      "test_fallback_default_verify_paths"
    ] ++ (optionals (hasPrefix "libressl" openssl.meta.name) failingLibresslTests);
  
    # Compose the final string expression, including the "-k" and the single quotes.
    testExpression = optionalString (disabledTests != [])
      "-k 'not ${concatStringsSep " and not " disabledTests}'";
  
  in
  
  
  buildPythonPackage rec {
    pname = "pyOpenSSL";
    version = "18.0.0";
  