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diff --git a/src/third_party/mac_headers/mach-o/fat.h b/src/third_party/mac_headers/mach-o/fat.h
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+/*
+ * Copyright (c) 1999 Apple Computer, 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 _MACH_O_FAT_H_
+#define _MACH_O_FAT_H_
+/*
+ * This header file describes the structures of the file format for "fat"
+ * architecture specific file (wrapper design).  At the begining of the file
+ * there is one fat_header structure followed by a number of fat_arch
+ * structures.  For each architecture in the file, specified by a pair of
+ * cputype and cpusubtype, the fat_header describes the file offset, file
+ * size and alignment in the file of the architecture specific member.
+ * The padded bytes in the file to place each member on it's specific alignment
+ * are defined to be read as zeros and can be left as "holes" if the file system
+ * can support them as long as they read as zeros.
+ *
+ * All structures defined here are always written and read to/from disk
+ * in big-endian order.
+ */
+
+/*
+ * <mach/machine.h> is needed here for the cpu_type_t and cpu_subtype_t types
+ * and contains the constants for the possible values of these types.
+ */
+#include <stdint.h>
+#include <mach/machine.h>
+#include <architecture/byte_order.h>
+
+#define FAT_MAGIC	0xcafebabe
+#define FAT_CIGAM	0xbebafeca	/* NXSwapLong(FAT_MAGIC) */
+
+struct fat_header {
+	uint32_t	magic;		/* FAT_MAGIC */
+	uint32_t	nfat_arch;	/* number of structs that follow */
+};
+
+struct fat_arch {
+	cpu_type_t	cputype;	/* cpu specifier (int) */
+	cpu_subtype_t	cpusubtype;	/* machine specifier (int) */
+	uint32_t	offset;		/* file offset to this object file */
+	uint32_t	size;		/* size of this object file */
+	uint32_t	align;		/* alignment as a power of 2 */
+};
+
+#endif /* _MACH_O_FAT_H_ */