+#ifdef DBUS_ENABLE_VERBOSE_MODE
+void _dbus_message_trace_ref (DBusMessage *message,
+ int old_refcount,
+ int new_refcount,
+ const char *why);
+#else
+/* this bypasses any "unused" warnings for the old and new refcount */
+#define _dbus_message_trace_ref(m, o, n, w) \
+ do \
+ {\
+ (void) (o); \
+ (void) (n); \
+ } while (0)
+#endif
+