--- ./projects/libcxx/include/__config.orig	2020-06-01 21:14:44.000000000 -0700
+++ ./projects/libcxx/include/__config	2020-06-01 21:15:02.000000000 -0700
@@ -1392,7 +1392,7 @@
      __attribute__((availability(tvos,strict,introduced=10.0)))                \
      __attribute__((availability(watchos,strict,introduced=3.0)))
 #  define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS                             \
-     __attribute__((availability(macosx,strict,introduced=10.14)))             \
+     __attribute__((availability(macosx,strict,introduced=10.13)))             \
      __attribute__((availability(ios,strict,introduced=12.0)))                 \
      __attribute__((availability(tvos,strict,introduced=12.0)))                \
      __attribute__((availability(watchos,strict,introduced=5.0)))