@@ -233,10 +233,11 @@
 # define OF_WARN_UNUSED_RESULT
 #endif
 
 #if __has_attribute(__unavailable__)
 # define OF_UNAVAILABLE __attribute__((__unavailable__))
+# define OF_HAVE_UNAVAILABLE
 #else
 # define OF_UNAVAILABLE
 #endif
 
 #if __has_attribute(__objc_requires_super__)