This should work

software/include/rijnfel_core/data_sink.h

@@ -18,9 +18,7 @@ public:
 	}
 	virtual ~cDataSink() {
 	}
-	virtual void ReceiveCallback(void * i_data, cDataReceiver * i_receiver){
-
-	}
+	virtual void ReceiveCallback(void * i_data, cDataReceiver * i_receiver) = 0;
 };
 }