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diff --git a/include/clang/Lex/DirectoryLookup.h b/include/clang/Lex/DirectoryLookup.h
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+++ b/include/clang/Lex/DirectoryLookup.h
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+//===--- DirectoryLookup.h - Info for searching for headers -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the DirectoryLookup interface.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LEX_DIRECTORYLOOKUP_H
+#define LLVM_CLANG_LEX_DIRECTORYLOOKUP_H
+
+namespace clang {
+class DirectoryEntry;
+
+/// DirectoryLookup - This class is used to specify the search order for
+/// directories in #include directives.
+class DirectoryLookup {
+public:
+  enum DirType {
+    NormalHeaderDir,
+    SystemHeaderDir,
+    ExternCSystemHeaderDir
+  };
+private:  
+  /// Dir - This is the actual directory that we're referring to.
+  ///
+  const DirectoryEntry *Dir;
+  
+  /// DirCharacteristic - The type of directory this is, one of the DirType enum
+  /// values.
+  DirType DirCharacteristic : 2;
+  
+  /// UserSupplied - True if this is a user-supplied directory.
+  ///
+  bool UserSupplied : 1;
+  
+  /// Framework - True if this is a framework directory search-path.
+  ///
+  bool Framework : 1;
+public:
+  DirectoryLookup(const DirectoryEntry *dir, DirType DT, bool isUser,
+                  bool isFramework)
+    : Dir(dir), DirCharacteristic(DT), UserSupplied(isUser),
+      Framework(isFramework) {}
+  
+  /// getDir - Return the directory that this entry refers to.
+  ///
+  const DirectoryEntry *getDir() const { return Dir; }
+  
+  /// DirCharacteristic - The type of directory this is, one of the DirType enum
+  /// values.
+  DirType getDirCharacteristic() const { return DirCharacteristic; }
+  
+  /// isUserSupplied - True if this is a user-supplied directory.
+  ///
+  bool isUserSupplied() const { return UserSupplied; }
+  
+  /// isFramework - True if this is a framework directory.
+  ///
+  bool isFramework() const { return Framework; }
+};
+
+}  // end namespace clang
+
+#endif