--- Libc/Libc-1725.40.4/os/api.h
+++ Libc/Libc-1353.11.2/os/api.h
@@ -52,8 +52,6 @@
 #include <os/availability.h>
 #include <stdint.h>
 
-OS_ASSUME_PTR_ABI_SINGLE_BEGIN;
-
 /*!
  * @const DARWIN_API_VERSION
  * The API version of the library. This version will be changed in accordance
@@ -73,7 +71,7 @@
  * individual preprocessor macros in this header that declare new behavior as
  * required.
  */
-#define DARWIN_API_VERSION 20210428u
+#define DARWIN_API_VERSION 20181020u
 
 #if !DARWIN_BUILDING_LIBSYSTEM_DARWIN
 #define DARWIN_API_AVAILABLE_20170407 \
@@ -82,30 +80,10 @@
 		API_AVAILABLE(macos(10.15), ios(13.0), tvos(13.0), watchos(6.0))
 #define DARWIN_API_AVAILABLE_20181020 \
 		API_AVAILABLE(macos(10.15), ios(13.0), tvos(13.0), watchos(6.0))
-#define DARWIN_API_AVAILABLE_20181020 \
-		API_AVAILABLE(macos(10.15), ios(13.0), tvos(13.0), watchos(6.0))
-#define DARWIN_API_AVAILABLE_20190830 \
-		API_AVAILABLE(macos(10.15.2), ios(13.3), tvos(13.3), watchos(6.1.1))
-#define DARWIN_API_AVAILABLE_20191015 \
-		API_AVAILABLE(macos(10.15.2), ios(13.3), tvos(13.3), watchos(6.1.1))
-#define DARWIN_API_AVAILABLE_20200220 \
-		API_AVAILABLE(macos(10.16), ios(14.0), tvos(14.0), watchos(7.0))
-#define DARWIN_API_AVAILABLE_20200401 \
-		API_AVAILABLE(macos(10.16), ios(14.0), tvos(14.0), watchos(7.0))
-#define DARWIN_API_AVAILABLE_20200526 \
-		API_AVAILABLE(macos(10.16), ios(14.0), tvos(14.0), watchos(7.0))
-#define DARWIN_API_AVAILABLE_20210428 \
-		API_AVAILABLE(macos(12.0), ios(15.0), tvos(15.0), watchos(8.0))
 #else
 #define DARWIN_API_AVAILABLE_20170407
 #define DARWIN_API_AVAILABLE_20180727
 #define DARWIN_API_AVAILABLE_20181020
-#define DARWIN_API_AVAILABLE_20190830
-#define DARWIN_API_AVAILABLE_20191015
-#define DARWIN_API_AVAILABLE_20200220
-#define DARWIN_API_AVAILABLE_20200401
-#define DARWIN_API_AVAILABLE_20200526
-#define DARWIN_API_AVAILABLE_20210428
 #endif
 
 /*!
@@ -120,6 +98,4 @@
  */
 typedef uint32_t os_struct_version_t;
 
-OS_ASSUME_PTR_ABI_SINGLE_END;
-
 #endif // __DARWIN_API_H