--- lib/utparse.y.orig	2008-07-23 01:47:24.000000000 +0900
+++ lib/utparse.y	2020-11-22 10:33:20.000000000 +0900
@@ -13,6 +13,8 @@
 #include "utscan.h"
 #include "utprivate.h"
 
+extern int utlex (void);
+
 /*
  * Allocate storage for the package global variables, which are declared in
  * header file "utprivate.h".