#if DEBUG
extern uint8_t ao_lco_debug;
-#define PRINTD(...) do { if (!ao_lco_debug) break; printf ("\r%5u %s: ", ao_tick_count, __func__); printf(__VA_ARGS__); flush(); } while(0)
+#define PRINTD(...) do { if (!ao_lco_debug) break; printf ("\r%5lu %s: ", (unsigned long) ao_tick_count, __func__); printf(__VA_ARGS__); flush(); } while(0)
#else
#define PRINTD(...)
#endif