--- loncom/homework/default_homework.lcpm	2008/06/12 00:46:52	1.136
+++ loncom/homework/default_homework.lcpm	2008/06/14 16:34:54	1.137
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
 #
-# $Id: default_homework.lcpm,v 1.136 2008/06/12 00:46:52 www Exp $
+# $Id: default_homework.lcpm,v 1.137 2008/06/14 16:34:54 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -424,10 +424,12 @@ sub caparesponse_check_list {
 }
 
 sub cas {
-    my ($system,$input)=@_;
+    my ($system,$input,$library)=@_;
     my $output;
     if ($system eq 'maxima') {
-       $output=&maxima_eval($input);
+       $output=&maxima_eval($input,$library);
+    } else {
+       $output='Error: unrecognized CAS';
     }
     return $output;
 }