1diff --git a/Source/JavaScriptCore/API/WebKitAvailability.h b/Source/JavaScriptCore/API/WebKitAvailability.h
2index ab53183..1310dec 100644
3--- a/Source/JavaScriptCore/API/WebKitAvailability.h
4+++ b/Source/JavaScriptCore/API/WebKitAvailability.h
5@@ -27,57 +27,12 @@
6 #define __WebKitAvailability__
7
8 #if defined(__APPLE__)
9-
10-#include <AvailabilityMacros.h>
11 #include <CoreFoundation/CoreFoundation.h>
12-
13-#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED < 101100
14-/* To support availability macros that mention newer OS X versions when building on older OS X versions,
15- we provide our own definitions of the underlying macros that the availability macros expand to. We're
16- free to expand the macros as no-ops since frameworks built on older OS X versions only ship bundled with
17- an application rather than as part of the system.
18-*/
19-
20-#ifndef __NSi_10_10 // Building from trunk rather than SDK.
21-#define __NSi_10_10 introduced=10.0 // Use 10.0 to indicate that everything is available.
22-#endif
23-
24-#ifndef __NSi_10_11 // Building from trunk rather than SDK.
25-#define __NSi_10_11 introduced=10.0 // Use 10.0 to indicate that everything is available.
26-#endif
27-
28-#ifndef __NSi_10_12 // Building from trunk rather than SDK.
29-#define __NSi_10_12 introduced=10.0 // Use 10.0 to indicate that everything is available.
30-#endif
31-
32-#ifndef __AVAILABILITY_INTERNAL__MAC_10_9
33-#define __AVAILABILITY_INTERNAL__MAC_10_9
34-#endif
35-
36-#ifndef __AVAILABILITY_INTERNAL__MAC_10_10
37-#define __AVAILABILITY_INTERNAL__MAC_10_10
38 #endif
39
40-#ifndef AVAILABLE_MAC_OS_X_VERSION_10_9_AND_LATER
41-#define AVAILABLE_MAC_OS_X_VERSION_10_9_AND_LATER
42-#endif
43-
44-#ifndef AVAILABLE_MAC_OS_X_VERSION_10_10_AND_LATER
45-#define AVAILABLE_MAC_OS_X_VERSION_10_10_AND_LATER
46-#endif
47-
48-#endif /* __MAC_OS_X_VERSION_MIN_REQUIRED <= 101100 */
49-
50-#if defined(BUILDING_GTK__)
51 #undef CF_AVAILABLE
52 #define CF_AVAILABLE(_mac, _ios)
53 #undef CF_ENUM_AVAILABLE
54 #define CF_ENUM_AVAILABLE(_mac, _ios)
55-#endif
56-
57-#else
58-#define CF_AVAILABLE(_mac, _ios)
59-#define CF_ENUM_AVAILABLE(_mac, _ios)
60-#endif
61
62 #endif /* __WebKitAvailability__ */