--- src-common/cfdg.ypp.orig	2021-10-04 13:54:54 UTC
+++ src-common/cfdg.ypp
@@ -31,7 +31,7 @@
 %skeleton "lalr1.cc"                          /*  -*- C++ -*- */
 %require "3.0"
 %defines
-%define parser_class_name {CfdgParser}
+%define api.parser.class {CfdgParser}
 %locations
 %expect 3
 //%debug