https://rt.cpan.org/Public/Bug/Display.html?id=57356

--- B-OPCheck-0.29/OPCheck.xs
+++ B-OPCheck-0.29/OPCheck.xs
@@ -12,10 +12,6 @@
 #define NEED_sv_2pv_flags
 #include "ppport.h"
 
-#if PERL_VERSION < 9
-typedef OP* (CPERLscope(*Perl_check_t)) (pTHX_ OP*);
-#endif
-
 STATIC AV **OPCHECK_subs;
 Perl_check_t *PL_check_orig;