-#if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE)) || (TARGET_OS_EMBEDDED || TARGET_OS_IPHONE)
-CF_EXPORT void CFMessagePortSetDispatchQueue(CFMessagePortRef ms, dispatch_queue_t queue) AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER;
-#endif
+CF_EXPORT void CFMessagePortSetDispatchQueue(CFMessagePortRef ms, dispatch_queue_t queue) CF_AVAILABLE(10_6, 4_0);