Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 3490)
+++ wp-includes/functions.php	(working copy)
@@ -1025,6 +1025,10 @@
 	$punc = '.:?\-';
 	$any = $ltrs . $gunk . $punc;
 
+	// allow for relative (to the site) enclosures
+	$content = str_replace(' href="/', ' href="http://' . $_SERVER['HTTP_HOST'] . '/', $content);
+	$content = str_replace(" href='/", " href='http://" . $_SERVER['HTTP_HOST'] . '/', $content);
+
 	preg_match_all("{\b http : [$any] +? (?= [$punc] * [^$any] | $)}x", $content, $post_links_temp);
 
 	debug_fwrite($log, 'Post contents:');