--- a/qtmobility/plugins/sensors/n900/n900filebasedsensor.h	Fri Apr 16 15:51:22 2010 +0300
+++ b/qtmobility/plugins/sensors/n900/n900filebasedsensor.h	Mon May 03 13:18:40 2010 +0300
@@ -50,9 +50,11 @@
 {
 public:
     n900filebasedsensor(QSensor *sensor);
+    virtual ~n900filebasedsensor();
 
-    void start();
-    void stop();
+    virtual void start();
+    virtual void stop();
+    virtual void poll() = 0;
     void timerEvent(QTimerEvent * /*event*/);
 
 private: