From b63940c108110c78eeb1430a2b0f5b1a9c87e99c Mon Sep 17 00:00:00 2001
From: "David E. O'Brien" <obrien@FreeBSD.org>
Date: Wed, 4 Dec 2013 19:15:56 +0000
Subject: [PATCH] Add missing bits from the vendor's 2005-05-04 change to
 contrib/byacc/makefile.in ("add YYPATCH here so it can be tested by
 applications") so that applications have a hope of detecting newer FreeBSD
 YACC output from an older one.

Submitted by: Juniper Networks
---
 usr.bin/yacc/Makefile | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/usr.bin/yacc/Makefile b/usr.bin/yacc/Makefile
index 677486fd7320..a5f0d1b78ba2 100644
--- a/usr.bin/yacc/Makefile
+++ b/usr.bin/yacc/Makefile
@@ -1,7 +1,8 @@
 #	@(#)Makefile	5.3 (Berkeley) 5/12/90
 # $FreeBSD$
 
-.PATH: ${.CURDIR}/../../contrib/byacc
+BYACC_SRC=	${.CURDIR}/../../contrib/byacc
+.PATH: ${BYACC_SRC}
 
 PROG=	yacc
 SRCS=	closure.c error.c graph.c lalr.c lr0.c main.c mkpar.c output.c \
@@ -12,7 +13,10 @@ CFLAGS+=	-DMIXEDCASE_FILENAMES=1 \
 		-DHAVE_FCNTL_H=1 \
 		-DHAVE_ATEXIT=1 \
 		-DHAVE_MKSTEMP=1
-		
+
+YYPATCH!=	cat ${BYACC_SRC}/VERSION
+CFLAGS+=	-DYYPATCH=${YYPATCH}
+
 LINKS=	${BINDIR}/yacc ${BINDIR}/byacc
 MLINKS=	yacc.1 byacc.1