PERLVAR(Iorslen, STRLEN)
PERLVAR(Iofmt, char *) /* $# */
+/* interpreter atexit processing */
+PERLVARI(Iexitlist, PerlExitListEntry *, NULL) /* list of exit functions */
+PERLVARI(Iexitlistlen, I32, 0) /* length of same */
+PERLVAR(Imodglobal, HV *) /* per-interp module data */
+
+#ifdef HAVE_INTERP_INTERN
+PERLVAR(Isys_intern, struct interp_intern) /* platform internals */
+#endif
+
#ifdef USE_THREADS
PERLVAR(Ithrsv, SV *) /* holds struct perl_thread for main thread */
PERLVARI(Ithreadnum, U32, 0) /* incremented each thread creation */