$OpenBSD: patch-factory_h,v 1.1 2012/02/29 12:46:30 dcoppa Exp $
--- factory.h.orig	Fri Aug  6 18:44:32 2010
+++ factory.h	Wed Feb 29 10:09:08 2012
@@ -12,6 +12,7 @@ template <class AbstractClass>
 class ObjectFactory
 {
 public:
+	virtual ~ObjectFactory () {}
 	virtual AbstractClass * CreateObject() const =0;
 };