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diff --git a/EdkModulePkg/Include/EdkPeimDepex.h b/EdkModulePkg/Include/EdkPeimDepex.h
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+/*++
+
+Copyright (c) 2006, Intel Corporation                                                         
+All rights reserved. This program and the accompanying materials                          
+are licensed and made available under the terms and conditions of the BSD License         
+which 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.             
+
+Module Name:
+  EdkPeimDepex.h
+
+Abstract:
+  This include file is only used in *.DXS files. Do not use this 
+  include file in normal Peim code.
+
+  Depex - Dependency Expresion
+
+  The BNF grammar is thus:
+     <depex>   ::= <bool>            
+     <bool>    ::= <bool> and <term> 
+                 | <bool> or <term>  
+                 | <term>            
+     <term>    ::= not <factor>      
+                 | <factor>          
+     <factor>  ::= <bool>            
+                 | <boolval>         
+                 | <depinst>         
+                 | <termval>         
+     <boolval> ::= true              
+                 | false             
+     <depinst> ::= push GUID         
+     <termval> ::= end               
+
+--*/
+
+#ifndef __EDK_PEIM_DEPEX_H__
+#define __EDK_PEIM_DEPEX_H__
+
+#include <EdkPeim.h>
+
+//
+// The Depex grammer needs the following strings so we must undo
+// any pre-processor redefinitions
+//
+#undef DEPENDENCY_START                          
+#undef AND                
+#undef OR                 
+#undef NOT                
+#undef TRUE               
+#undef FALSE                                        
+#undef DEPENDENCY_END     
+
+#endif