py27-gobject @2.28.7. Build fails on Big Sur: Undefined symbols for architecture x86_64: "_PyCObject_AsVoidPtr" and others

[kencu (Ken)]

1 warning generated.
  CCLD   libpyglib-2.0-python2.7.la
1 warning generated.
1 warning generated.
Undefined symbols for architecture x86_64:
  "_PyCObject_AsVoidPtr", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_init_internal in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyCObject_Type", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyDict_GetItem", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyDict_New", referenced from:
      _pyglib_register_exception_for_domain in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyDict_SetItem", referenced from:
      _pyglib_register_exception_for_domain in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_Fetch", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_Format", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_GivenExceptionMatches", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_NewException", referenced from:
      _pyglib_register_exception_for_domain in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_NormalizeException", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_Occurred", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_Print", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
      __pyglib_handler_marshal in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_Restore", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_SetObject", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_SetString", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyEval_InitThreads", referenced from:
      _pyglib_enable_threads in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyExc_ImportError", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyExc_ValueError", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyFloat_FromDouble", referenced from:
      _pyglib_float_from_timeval in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyGILState_Ensure", referenced from:
      _pyglib_gil_state_ensure in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gil_state_ensure_py23 in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyGILState_Release", referenced from:
      _pyglib_gil_state_release in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gil_state_release_py23 in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyImport_ImportModule", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyInt_AsLong", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyInt_FromLong", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_register_exception_for_domain in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyObject_CallObject", referenced from:
      __pyglib_handler_marshal in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyObject_GetAttrString", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyObject_IsTrue", referenced from:
      __pyglib_handler_marshal in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyObject_Repr", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyObject_SetAttrString", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyString_AsString", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyString_FromString", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyThread_create_key", referenced from:
      _pyglib_enable_threads in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyTuple_GetItem", referenced from:
      __pyglib_handler_marshal in libpyglib_2_0_python2.7_la-pyglib.o
  "__PyObject_CallFunction_SizeT", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "__Py_NoneStruct", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "__Py_NotImplementedStruct", referenced from:
      __pyglib_generic_ptr_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
      __pyglib_generic_long_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
  "__Py_TrueStruct", referenced from:
      __pyglib_generic_ptr_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
      __pyglib_generic_long_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
  "__Py_ZeroStruct", referenced from:
      __pyglib_generic_ptr_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
      __pyglib_generic_long_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
ld: symbol(s) not found for architecture x86_64