-extern void stopProfTimer ( void );
-extern void startProfTimer ( void );
-extern void stopHeapProfTimer ( void );
-extern void startHeapProfTimer ( void );
+void initProfTimer ( void );
+void handleProfTick ( void );
+
+#ifdef PROFILING
+void stopProfTimer ( void );
+void startProfTimer ( void );
+#endif
+
+void stopHeapProfTimer ( void );
+void startHeapProfTimer ( void );