--- /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/Availability.h	2019-11-07 07:07:28.000000000 +0100
+++ Availability.h	2020-01-18 12:17:58.000000000 +0100
@@ -307,6 +307,12 @@
     #define __OSX_AVAILABLE_BUT_DEPRECATED_MSG(_osxIntro, _osxDep, _iosIntro, _iosDep, _msg)
 #endif
 
+#ifndef __OSX_AVAILABLE_STARTING
+    #define __OSX_AVAILABLE_STARTING(_osx, _ios)
+    #define __OSX_AVAILABLE_BUT_DEPRECATED(_osxIntro, _osxDep, _iosIntro, _iosDep)
+    #define __OSX_AVAILABLE_BUT_DEPRECATED_MSG(_osxIntro, _osxDep, _iosIntro, _iosDep, _msg)
+#endif
+
 
 #if defined(__has_feature)
   #if __has_feature(attribute_availability_with_message)