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diff --git a/StdLib/Include/stddef.h b/StdLib/Include/stddef.h
new file mode 100644
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+++ b/StdLib/Include/stddef.h
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+/** @file
+  Common 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.
+
+**/
+#ifndef _STDDEF_H
+#define _STDDEF_H
+#include  <sys/EfiCdefs.h>
+
+/** ptrdiff_t is the signed integer type of the result of subtracting two pointers.
+**/
+#ifdef _EFI_PTRDIFF_T_
+  typedef _EFI_PTRDIFF_T_  ptrdiff_t;
+  #undef _EFI_PTRDIFF_T_
+#endif
+
+/** size_t is the unsigned integer type of the result of the sizeof operator.
+**/
+#ifdef _EFI_SIZE_T_
+  typedef _EFI_SIZE_T_  size_t;
+  #undef _EFI_SIZE_T_
+  #undef _BSD_SIZE_T_
+#endif
+
+/** wchar_t is an integer type whose range of values can represent distinct
+    codes for all members of the largest extended character set specified among
+    the supported locales.  The null character shall have the code value zero.
+**/
+#ifndef __cplusplus
+  #ifdef _EFI_WCHAR_T
+    typedef _EFI_WCHAR_T wchar_t;
+    #undef  _EFI_WCHAR_T
+    #undef _BSD_WCHAR_T_
+  #endif
+#endif
+
+/** NULL expands to an implementation-defined null pointer constant.
+    NULL is defined in MdePkg/Include/Base.h which is automatically included
+    by the EDK II build tools.
+**/
+
+/** offsetof(type, member-designator) expands to an integer constant expression
+    that has type size_t, the value of which is the offset in bytes, to the
+    structure member (designated by member-designator), from the beginning of
+    its structure (designated by type). The type and member designator shall be
+    such that given<BR>
+    static type t;<BR>
+    then the expression &(t.member-designator) evaluates to an address constant.
+    (If the specified member is a bit-field, the behavior is undefined.)
+
+    Alliased to OFFSET_OF which is defined in MdePkg/Include/Base.h which is
+    automatically included by the EDK II build tools.
+**/
+#define offsetof(type, member)  OFFSET_OF(type, member)
+
+#endif  /* _STDDEF_H */