-#if SU_HAS_PERL(5, 13, 10)
-
-/* Since perl 5.13.10, GvCV() is only a rvalue so we no longer can store a
- * pointer to the gvcv member of the gv. */
+#if !SU_HAS_PERL(5, 10, 0) && !defined(mro_method_changed_in)
+# define mro_method_changed_in(G) PL_sub_generation++
+#endif