From 673d6c958050b7ce07d5d8512d5370f9531225cd Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@kitenet.net>
Date: Wed, 21 Apr 2010 19:45:56 -0400
Subject: [PATCH] add missing undef guard in derel

---
 IkiWiki.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/IkiWiki.pm b/IkiWiki.pm
index 4084d4997..8af290745 100644
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -2245,7 +2245,7 @@ sub derel ($$) {
 	if ($path =~ m!^\./!) {
 		$from=~s#/?[^/]+$## if defined $from;
 		$path=~s#^\./##;
-		$path="$from/$path" if length $from;
+		$path="$from/$path" if defined $from && length $from;
 	}
 
 	return $path;