Index: Include/object.h
===================================================================
--- Include/object.h	(revision 68813)
+++ Include/object.h	(working copy)
@@ -653,6 +653,13 @@
 	_Py_INC_REFTOTAL  _Py_REF_DEBUG_COMMA	\
 	((PyObject*)(op))->ob_refcnt++)
 
+#  if (__GNUC__ < 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ <= 95))
+#  define __builtin_expect(exp, prediction)  (exp)
+#  endif
+
+#define likely(x)   __builtin_expect(!!(x), 1)
+#define unlikely(x) __builtin_expect(!!(x), 0)
+
 #define Py_DECREF(op)					\
 	if (_Py_DEC_REFTOTAL  _Py_REF_DEBUG_COMMA	\
 	    --((PyObject*)(op))->ob_refcnt != 0)		\