--- __config.old	2021-03-14 23:24:47.000000000 -0700
+++ __config	2021-03-14 23:27:23.000000000 -0700
@@ -20,6 +20,9 @@
 #pragma GCC system_header
 #endif
 
+// we are not going to use Apple Availability testing in these headers
+#define _LIBCPP_DISABLE_AVAILABILITY
+
 #ifdef __cplusplus
 
 #ifdef __GNUC__
