Since the *_Init() are private, prefix with _, suggested by Skip

Include/intobject.h

@@ -30,7 +30,7 @@ PyAPI_DATA(PyTypeObject) PyInt_Type;
 #define PyInt_Check(op) PyObject_TypeCheck(op, &PyInt_Type)
 #define PyInt_CheckExact(op) ((op)->ob_type == &PyInt_Type)
 
-PyAPI_FUNC(int) PyInt_Init(void);
+PyAPI_FUNC(int) _PyInt_Init(void);
 PyAPI_FUNC(PyObject *) PyInt_FromString(char*, char**, int);
 #ifdef Py_USING_UNICODE
 PyAPI_FUNC(PyObject *) PyInt_FromUnicode(Py_UNICODE*, int, int);

Include/pythonrun.h

@@ -100,7 +100,7 @@ PyAPI_FUNC(PyObject *) _PySys_Init(void);
 PyAPI_FUNC(void) _PyImport_Init(void);
 PyAPI_FUNC(void) _PyExc_Init(void);
 PyAPI_FUNC(void) _PyImportHooks_Init(void);
-PyAPI_FUNC(int) PyFrame_Init(void);
+PyAPI_FUNC(int) _PyFrame_Init(void);
 
 /* Various internal finalizers */
 PyAPI_FUNC(void) _PyExc_Fini(void);

Objects/frameobject.c

@@ -527,7 +527,7 @@ PyTypeObject PyFrame_Type = {
 
 static PyObject *builtin_object;
 
-int PyFrame_Init()
+int _PyFrame_Init()
 {
 	builtin_object = PyString_InternFromString("__builtins__");
 	return (builtin_object != NULL);

Objects/intobject.c

@@ -939,7 +939,7 @@ PyTypeObject PyInt_Type = {
 };
 
 int
-PyInt_Init(void)
+_PyInt_Init(void)
 {
 	PyIntObject *v;
 	int ival;

Python/pythonrun.c

@@ -124,10 +124,10 @@ Py_Initialize(void)
 
 	_Py_ReadyTypes();
 
-	if (!PyFrame_Init())
+	if (!_PyFrame_Init())
 		Py_FatalError("Py_Initialize: can't init frames");
 
-	if (!PyInt_Init())
+	if (!_PyInt_Init())
 		Py_FatalError("Py_Initialize: can't init ints");
 
 	interp->modules = PyDict_New();