#define PL_appctx (*Perl_Gappctx_ptr(NULL))
#undef PL_check
#define PL_check (*Perl_Gcheck_ptr(NULL))
+#undef PL_check_mutex
+#define PL_check_mutex (*Perl_Gcheck_mutex_ptr(NULL))
#undef PL_csighandlerp
#define PL_csighandlerp (*Perl_Gcsighandlerp_ptr(NULL))
#undef PL_curinterp