add header guard when generating bind.keys.h

util/bindkeys.pl

@@ -9,8 +9,6 @@
 # See the COPYRIGHT file distributed with this work for additional
 # information regarding copyright ownership.
 
-# $Id: bindkeys.pl,v 1.7 2011/01/04 23:47:13 tbox Exp $
-
 use strict;
 use warnings;
 
@@ -31,6 +29,9 @@ $lines =~ s/managed-keys/trusted-keys/;
 $lines =~ s/\s+initial-key//g;
 my $tkey = '#define TRUSTED_KEYS "\\' . "\n" . $lines . "\"\n";
 
+print "#ifndef BIND_KEYS_H\n";
+print "#define BIND_KEYS_H 1\n";
 print $tkey;
 print "\n";
 print $mkey;
+print "#endif /* BIND_KEYS_H */\n";