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diff --git a/include/clang/Lex/DirectoryLookup.h b/include/clang/Lex/DirectoryLookup.h
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+//===--- DirectoryLookup.h - Info for searching for headers -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file 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
+
+#include "clang/Basic/SourceManager.h"
+
+namespace clang {
+class HeaderMap;
+class DirectoryEntry;
+class FileEntry;
+class HeaderSearch;
+
+/// DirectoryLookup - This class represents one entry in the search list that
+/// specifies the search order for directories in #include directives.  It
+/// represents either a directory, a framework, or a headermap.
+///
+class DirectoryLookup {
+public:
+  enum LookupType_t {
+    LT_NormalDir,
+    LT_Framework,
+    LT_HeaderMap
+  };
+private:
+  union {  // This union is discriminated by isHeaderMap.
+    /// Dir - This is the actual directory that we're referring to for a normal
+    /// directory or a framework.
+    const DirectoryEntry *Dir;
+  
+    /// Map - This is the HeaderMap if this is a headermap lookup.
+    ///
+    const HeaderMap *Map;
+  } u;
+  
+  /// DirCharacteristic - The type of directory this is: this is an instance of
+  /// SrcMgr::CharacteristicKind.
+  unsigned DirCharacteristic : 2;
+  
+  /// UserSupplied - True if this is a user-supplied directory.
+  ///
+  bool UserSupplied : 1;
+  
+  /// LookupType - This indicates whether this DirectoryLookup object is a
+  /// normal directory, a framework, or a headermap.
+  unsigned LookupType : 2;
+public:
+  /// DirectoryLookup ctor - Note that this ctor *does not take ownership* of
+  /// 'dir'.
+  DirectoryLookup(const DirectoryEntry *dir, SrcMgr::CharacteristicKind DT,
+                  bool isUser, bool isFramework)
+    : DirCharacteristic(DT), UserSupplied(isUser),
+     LookupType(isFramework ? LT_Framework : LT_NormalDir) {
+    u.Dir = dir; 
+  }
+  
+  /// DirectoryLookup ctor - Note that this ctor *does not take ownership* of
+  /// 'map'.
+  DirectoryLookup(const HeaderMap *map, SrcMgr::CharacteristicKind DT,
+                  bool isUser)
+    : DirCharacteristic(DT), UserSupplied(isUser), LookupType(LT_HeaderMap) {
+    u.Map = map; 
+  }
+  
+  /// getLookupType - Return the kind of directory lookup that this is: either a
+  /// normal directory, a framework path, or a HeaderMap.
+  LookupType_t getLookupType() const { return (LookupType_t)LookupType; }
+  
+  /// getName - Return the directory or filename corresponding to this lookup
+  /// object.
+  const char *getName() const;
+  
+  /// getDir - Return the directory that this entry refers to.
+  ///
+  const DirectoryEntry *getDir() const { return isNormalDir() ? u.Dir : 0; }
+
+  /// getFrameworkDir - Return the directory that this framework refers to.
+  ///
+  const DirectoryEntry *getFrameworkDir() const {
+    return isFramework() ? u.Dir : 0;
+  }
+  
+  /// getHeaderMap - Return the directory that this entry refers to.
+  ///
+  const HeaderMap *getHeaderMap() const { return isHeaderMap() ? u.Map : 0; }
+
+  /// isNormalDir - Return true if this is a normal directory, not a header map.
+  bool isNormalDir() const { return getLookupType() == LT_NormalDir; }
+  
+  /// isFramework - True if this is a framework directory.
+  ///
+  bool isFramework() const { return getLookupType() == LT_Framework; }
+  
+  /// isHeaderMap - Return true if this is a header map, not a normal directory.
+  bool isHeaderMap() const { return getLookupType() == LT_HeaderMap; }
+  
+  /// DirCharacteristic - The type of directory this is, one of the DirType enum
+  /// values.
+  SrcMgr::CharacteristicKind getDirCharacteristic() const {
+    return (SrcMgr::CharacteristicKind)DirCharacteristic;
+  }
+  
+  /// isUserSupplied - True if this is a user-supplied directory.
+  ///
+  bool isUserSupplied() const { return UserSupplied; }
+  
+  
+  /// LookupFile - Lookup the specified file in this search path, returning it
+  /// if it exists or returning null if not.
+  const FileEntry *LookupFile(const char *FilenameStart,
+                              const char *FilenameEnd, HeaderSearch &HS) const;
+  
+private:
+  const FileEntry *DoFrameworkLookup(const char *FilenameStart,
+                                     const char *FilenameEnd, 
+                                     HeaderSearch &HS) const;
+  
+};
+
+}  // end namespace clang
+
+#endif