From 82bf0f4d488f2f5d1676de7a4b86302e73f34bab Mon Sep 17 00:00:00 2001
From: Thomas Adam <thomas.adam@smoothwall.net>
Date: Thu, 23 May 2019 13:09:34 +0100
Subject: [PATCH] configure.ac: add AC_PROC_YACC

---
 configure.ac | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/configure.ac b/configure.ac
index d09fec9d..355cf0b4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -659,5 +659,7 @@ CFLAGS="$SAVED_CFLAGS"
 AC_SUBST(AM_LDFLAGS)
 LDFLAGS="$SAVED_LDFLAGS"
 
+AC_PROG_YACC
+
 # autoconf should create a Makefile.
 AC_OUTPUT(Makefile)