+PERLVARI(Ibeginav_save, AV*, Nullav) /* save BEGIN{}s when compiling */
+
+#ifdef USE_5005THREADS
+PERLVAR(Ifdpid_mutex, perl_mutex) /* mutex for fdpid array */
+PERLVAR(Isv_lock_mutex, perl_mutex) /* mutex for SvLOCK macro */
+#endif
+
+PERLVAR(Inullstash, HV *) /* illegal symbols end up here */
+
+PERLVAR(Ixnv_arenaroot, XPV*) /* list of allocated xnv areas */
+PERLVAR(Ixrv_arenaroot, XPV*) /* list of allocated xrv areas */
+PERLVAR(Ixpv_arenaroot, XPV*) /* list of allocated xpv areas */
+PERLVAR(Ixpviv_arenaroot,XPVIV*) /* list of allocated xpviv areas */
+PERLVAR(Ixpvnv_arenaroot,XPVNV*) /* list of allocated xpvnv areas */
+PERLVAR(Ixpvcv_arenaroot,XPVCV*) /* list of allocated xpvcv areas */
+PERLVAR(Ixpvav_arenaroot,XPVAV*) /* list of allocated xpvav areas */
+PERLVAR(Ixpvhv_arenaroot,XPVHV*) /* list of allocated xpvhv areas */
+PERLVAR(Ixpvmg_arenaroot,XPVMG*) /* list of allocated xpvmg areas */
+PERLVAR(Ixpvlv_arenaroot,XPVLV*) /* list of allocated xpvlv areas */
+PERLVAR(Ixpvbm_arenaroot,XPVBM*) /* list of allocated xpvbm areas */
+PERLVAR(Ihe_arenaroot, XPV*) /* list of allocated he areas */
+
+ /* 5.6.0 stopped here */
+
+PERLVAR(Ipsig_pend, int *) /* per-signal "count" of pending */
+PERLVARI(Isig_pending, int,0) /* Number if highest signal pending */
+
+#ifdef USE_LOCALE_NUMERIC
+
+PERLVAR(Inumeric_radix_sv, SV *) /* The radix separator if not '.' */
+
+#endif
+
+#if defined(USE_ITHREADS)
+PERLVAR(Iregex_pad, SV**) /* All regex objects */
+PERLVAR(Iregex_padav, AV*) /* All regex objects */
+
+#ifdef USE_REENTRANT_API
+PERLVAR(Ireentrant_buffer, REBUF*) /* here we store the _r buffers */
+#endif
+
+PERLVAR(sharedsv_space, PerlInterpreter*)
+PERLVAR(sharesv_space_mutex, perl_mutex)
+
+#endif
+
+PERLVAR(Isavebegin, bool) /* save BEGINs for compiler */
+
+PERLVAR(Icustom_op_names, HV*) /* Names of user defined ops */
+PERLVAR(Icustom_op_descs, HV*) /* Descriptions of user defined ops */
+
+/* New variables must be added to the very end for binary compatibility.
+ * XSUB.h provides wrapper functions via perlapi.h that make this
+ * irrelevant, but not all code may be expected to #include XSUB.h. */