--- a/Include/object.h	Sat Feb 18 14:42:57 2012 +0100
+++ b/Include/object.h	Sun Feb 19 10:49:30 2012 +0100
@@ -473,6 +473,12 @@ PyAPI_FUNC(void) Py_ReprLeave(PyObject *
 PyAPI_FUNC(long) _Py_HashDouble(double);
 PyAPI_FUNC(long) _Py_HashPointer(void*);
 
+typedef struct {
+    long prefix;
+    long suffix;
+} _Py_HashSecret_t;
+PyAPI_DATA(_Py_HashSecret_t) _Py_HashSecret;
+
 /* Helper for passing objects to printf and the like */
 #define PyObject_REPR(obj) _PyUnicode_AsString(PyObject_Repr(obj))