--- modules/jpegtran/classes/JpegtranToolkitHelper.class	2008-07-29 19:02:08.000000000 +0900
+++ modules/jpegtran/classes/JpegtranToolkitHelper.class	2011-12-07 04:52:37.258771390 +0900
@@ -141,7 +141,7 @@ 
 	    $detectsDimensions = false;
 	    $isFinished = false;
 	    while (null !== ($line = array_shift($stderr))) {
-		if (preg_match("/Independent JPEG Group's JPEGTRAN/", $line)) {
+		if (preg_match("/Independent JPEG Group's (JPEGTRAN|libjpeg)/", $line)) {
 		    $isJpegtran = true;
 		} else if (preg_match('/Start Of Frame 0xc0: width=50, height=50, components=3/',
 				      $line)) {