From 77a6831b74c4edfc39aa1656097df9ceca7ad356 Mon Sep 17 00:00:00 2001
From: ru <ru@FreeBSD.org>
Date: Wed, 23 Jan 2008 22:21:36 +0000
Subject: Support source upgrades from at least 6.0-RELEASE.

Reviewed by:	imp, obrien
---
 Makefile.inc1 | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'Makefile.inc1')

diff --git a/Makefile.inc1 b/Makefile.inc1
index 6b5c9a3..eb4a211 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -841,6 +841,10 @@ update:
 # legacy: Build compatibility shims for the next three targets
 #
 legacy:
+.if ${BOOTSTRAPPING} < 600034 && ${BOOTSTRAPPING} != 0
+	@echo "ERROR: Source upgrades from versions prior to 6.0 not supported."; \
+	false
+.endif
 .for _tool in tools/build
 	${_+_}@${ECHODIR} "===> ${_tool} (obj,includes,depend,all,install)"; \
 	    cd ${.CURDIR}/${_tool}; \
-- 
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