Index: src/macros.h
==================================================================
--- src/macros.h
+++ src/macros.h
@@ -306,10 +306,21 @@
 #if __has_attribute(__swift_name__)
 # define OF_SWIFT_NAME(name) __attribute__((__swift_name__(name)))
 #else
 # define OF_SWIFT_NAME(name)
 #endif
+
+#if __has_attribute(__objc_direct__)
+# define OF_DIRECT __attribute__((__objc_direct__))
+#else
+# define OF_DIRECT
+#endif
+#if __has_attribute(__objc_direct_members__)
+# define OF_DIRECT_MEMBERS __attribute__((__objc_direct_members__))
+#else
+# define OF_DIRECT_MEMBERS
+#endif
 
 #ifdef __GNUC__
 # ifdef OF_X86_64
 #  define OF_X86_64_ASM
 # endif