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diff --git a/StdLib/Include/X64/machine/int_types.h b/StdLib/Include/X64/machine/int_types.h
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+++ b/StdLib/Include/X64/machine/int_types.h
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+/** @file
+    Machine dependent integer type definitions.
+
+    Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
+    This program and the accompanying materials are licensed and made available
+    under the terms and conditions of the BSD License that accompanies this
+    distribution.  The full text of the license may be found at
+    http://opensource.org/licenses/bsd-license.php.
+
+    THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+    WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+    Copyright (c) 1990, 1993
+    The Regents of the University of California.  All rights reserved.
+
+    This code is derived from software contributed to Berkeley by
+    Chris Torek.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+      - Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+      - Redistributions in binary form must reproduce the above copyright
+        notice, this list of conditions and the following disclaimer in the
+        documentation and/or other materials provided with the distribution.
+      - Neither the name of the University nor the names of its contributors
+        may be used to endorse or promote products derived from this software
+        without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+    ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+
+    NetBSD: int_types.h,v 1.5 2005/12/24 20:06:47 perry Exp
+    types.h 7.5 (Berkeley) 3/9/91
+**/
+#ifndef _AMD64_INT_TYPES_H_
+#define _AMD64_INT_TYPES_H_
+
+#include  <sys/EfiCdefs.h>
+
+/*
+ * 7.18.1 Integer types
+ */
+
+/* 7.18.1.1 Exact-width integer types */
+
+typedef INT8    __int8_t;
+typedef UINT8   __uint8_t;
+typedef INT16   __int16_t;
+typedef UINT16  __uint16_t;
+typedef INT32   __int32_t;
+typedef UINT32  __uint32_t;
+typedef INT64   __int64_t;
+typedef UINT64  __uint64_t;
+
+#define __BIT_TYPES_DEFINED__
+
+/* 7.18.1.4 Integer types capable of holding object pointers */
+
+typedef INTN      __intptr_t;
+typedef UINTN     __uintptr_t;
+
+#endif  /* !_AMD64_INT_TYPES_H_ */