From c165f4ab694b3f8157d52867930b92e1dc0180cd Mon Sep 17 00:00:00 2001
From: Hiroki Sato <hrs@FreeBSD.org>
Date: Wed, 18 Mar 2020 08:00:46 +0000
Subject: [PATCH] -F is GNU diff specific, not implemented in BSD diff.

Reported by:	kouya@ryuhoku.jp
MFC after:	3 days
---
 share/examples/ipfw/change_rules.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/share/examples/ipfw/change_rules.sh b/share/examples/ipfw/change_rules.sh
index 6148630a373..c33ce2680c4 100755
--- a/share/examples/ipfw/change_rules.sh
+++ b/share/examples/ipfw/change_rules.sh
@@ -149,7 +149,7 @@ cat <<!
 The new rules are now installed. The previous rules have been preserved in
 the file ${edit_file}.$DATE
 !
-diff -F "^# .*[A-Za-z]" -u ${edit_file}.$DATE ${edit_file} \
+diff -u ${edit_file}.$DATE ${edit_file} \
     | mail -s "`hostname` Firewall rule change" root
 rm ${TMPFILE}
 exit 0