--- a/src/devices/wifi/dca-txop.h	Tue Sep 15 00:05:36 2009 -0700
+++ b/src/devices/wifi/dca-txop.h	Tue Sep 15 10:47:02 2009 +0200
@@ -127,6 +127,7 @@
   void NotifyAccessGranted (void);
   void NotifyInternalCollision (void);
   void NotifyCollision (void);
+  void NotifyChannelSwitching (void); 
   /* event handlers */
   void GotCts (double snr, WifiMode txMode);
   void MissedCts (void);