--- /dev/null
+/*
+ * Copyright (c) 2012,2014 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+#ifndef sec_SOSARCDefines_h
+#define sec_SOSARCDefines_h
+
+#ifndef __has_feature
+#define __has_feature(x) 0
+#endif
+#ifndef __has_extension
+#define __has_extension __has_feature // Compatibility with pre-3.0 compilers.
+#endif
+
+#if __has_feature(objc_arc) && __clang_major__ >= 3
+#define ARC_ENABLED 1
+#endif // __has_feature(objc_arc)
+
+#if !ARC_ENABLED || !defined(__clang__) || __clang_major__ < 3
+
+#ifndef __bridge
+#define __bridge
+#endif
+#ifndef __bridge_retained
+#define __bridge_retained
+#endif
+#ifndef __bridge_transfer
+#define __bridge_transfer
+#endif
+#ifndef __autoreleasing
+#define __autoreleasing
+#endif
+#ifndef __strong
+#define __strong
+#endif
+#ifndef __weak
+#define __weak
+#endif
+#ifndef __unsafe_unretained
+#define __unsafe_unretained
+#endif
+
+#endif // __clang_major__ < 3
+
+#endif