Guess we have to add this

from_cpython/Include/Python.h

@@ -137,7 +137,7 @@ PyAPI_FUNC(void) PyType_SetDict(PyTypeObject*, PyObject*) PYSTON_NOEXCEPT;
 PyAPI_FUNC(PyObject*) PyGC_RegisterStaticConstant(PyObject*) PYSTON_NOEXCEPT;
 
 // Gets gc.garbage
-PyAPI_FUNC(PyObject*) _PyGC_GetGarbage() PYSTON_NOEXCEPT;
+PyAPI_FUNC(PyObject*) _PyGC_GetGarbage(void) PYSTON_NOEXCEPT;
 
 // Pyston addition:
 PyAPI_FUNC(void) PyGC_Enable() PYSTON_NOEXCEPT;