#define PL_op (*Perl_Iop_ptr(aTHX))
#undef PL_op_mask
#define PL_op_mask (*Perl_Iop_mask_ptr(aTHX))
+#undef PL_opfreehook
+#define PL_opfreehook (*Perl_Iopfreehook_ptr(aTHX))
#undef PL_opsave
#define PL_opsave (*Perl_Iopsave_ptr(aTHX))
#undef PL_origalen