+/* Note that from here --> to <-- the same logic is
+ * repeated in makedef.pl, so be certain to update
+ * both places when editing. */
+
+#ifdef PERL_IMPLICIT_SYS
+/* PERL_IMPLICIT_SYS implies PerlMemShared != PerlMem
+ so use slab allocator to avoid lots of MUTEX overhead
+ */
+# ifndef PL_OP_SLAB_ALLOC
+# define PL_OP_SLAB_ALLOC
+# endif
+#endif
+