#define PL_bufptr (*Perl_Ibufptr_ptr(aTHXo))
#undef PL_checkav
#define PL_checkav (*Perl_Icheckav_ptr(aTHXo))
+#undef PL_clone_callbacks
+#define PL_clone_callbacks (*Perl_Iclone_callbacks_ptr(aTHXo))
#undef PL_collation_ix
#define PL_collation_ix (*Perl_Icollation_ix_ptr(aTHXo))
#undef PL_collation_name