#define PL_svref_mutex (*Perl_Isvref_mutex_ptr(aTHX))
#undef PL_sys_intern
#define PL_sys_intern (*Perl_Isys_intern_ptr(aTHX))
+#undef PL_taint_warn
+#define PL_taint_warn (*Perl_Itaint_warn_ptr(aTHX))
#undef PL_tainting
#define PL_tainting (*Perl_Itainting_ptr(aTHX))
#undef PL_threadnum