Renamed _length_cue() to __length_hint__().  See:
http://mail.python.org/pipermail/python-dev/2006-February/060524.html
diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index a7ecf93..4b8ed69 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -2346,10 +2346,10 @@
         return PyInt_FromLong(ro->cnt);
 }
 
-PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it)).");
+PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
 
 static PyMethodDef repeat_methods[] = {
-	{"_length_cue", (PyCFunction)repeat_len, METH_NOARGS, length_cue_doc},
+	{"__length_hint__", (PyCFunction)repeat_len, METH_NOARGS, length_hint_doc},
  	{NULL,		NULL}		/* sentinel */
 };