PERLVARI(Imy_cxt_list, void **, NULL) /* per-module array of MY_CXT pointers */
#endif
+#ifdef PERL_TRACK_MEMPOOL
+/* For use with the memory debugging code in util.c */
+PERLVAR(Imemory_debug_header, struct perl_memory_debug_header)
+#endif
+
/* New variables must be added to the very end, before this comment,
* for binary compatibility (the offsets of the old members must not change).
* (Don't forget to add your variable also to perl_clone()!)