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diff --git a/include/clang/Lex/PPCallbacks.h b/include/clang/Lex/PPCallbacks.h
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+++ b/include/clang/Lex/PPCallbacks.h
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+//===--- PPCallbacks.h - Callbacks for Preprocessor actions -----*- 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 PPCallbacks interface.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LEX_PPCALLBACKS_H
+#define LLVM_CLANG_LEX_PPCALLBACKS_H
+
+#include "clang/Lex/DirectoryLookup.h"
+#include "clang/Basic/SourceLocation.h"
+#include <string>
+
+namespace clang {
+  class SourceLocation;
+    
+/// PPCallbacks - This interface provides a way to observe the actions of the
+/// preprocessor as it does its thing.  Clients can define their hooks here to
+/// implement preprocessor level tools.
+class PPCallbacks {
+public:
+  virtual ~PPCallbacks();
+  
+  enum FileChangeReason {
+    EnterFile, ExitFile, SystemHeaderPragma, RenameFile
+  };
+  
+  /// FileChanged - This callback is invoked whenever a source file is
+  /// entered or exited.  The SourceLocation indicates the new location, and
+  /// EnteringFile indicates whether this is because we are entering a new
+  /// #include'd file (when true) or whether we're exiting one because we ran
+  /// off the end (when false).
+  virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason,
+                           DirectoryLookup::DirType FileType) {
+  }
+  
+  /// Ident - This callback is invoked when a #ident or #sccs directive is read.
+  ///
+  virtual void Ident(SourceLocation Loc, const std::string &str) {
+  }
+  
+};
+
+}  // end namespace clang
+
+#endif