--- hk_classes/hk_database.h.orig	Thu Jul 15 22:02:22 2004
+++ hk_classes/hk_database.h	Thu Jul 15 22:02:36 2004
@@ -14,6 +14,7 @@
 #include <list>
 #include <vector>
 #include <algorithm>
+#include <sstream>
 #include "hk_presentation.h"
 using namespace std;