From 00812c9053a0b1067f833925b726086a67d8528d Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Tue, 2 Aug 2022 11:52:09 +0100
Subject: [PATCH] Check for $YACC, from Wei Shih in GitHub issue 3267.

---
 configure.ac | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/configure.ac b/configure.ac
index 276f71c8..8e846042 100644
--- a/configure.ac
+++ b/configure.ac
@@ -267,6 +267,12 @@ if test "x$found_libevent" = xno; then
 	AC_MSG_ERROR("libevent not found")
 fi
 
+# Look for yacc.
+AC_CHECK_PROG(found_yacc, $YACC, yes, no)
+if test "x$found_yacc" = xno; then
+	AC_MSG_ERROR("yacc not found")
+fi
+
 # Look for ncurses or curses. Try pkg-config first then directly for the
 # library.
 PKG_CHECK_MODULES(