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diff --git a/Source/cmVariableWatchCommand.h b/Source/cmVariableWatchCommand.h
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+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef cmVariableWatchCommand_h
+#define cmVariableWatchCommand_h
+
+#include "cmCommand.h"
+
+class cmVariableWatchCommandHandler
+{
+public:
+  typedef std::vector<std::string> VectorOfCommands;
+  VectorOfCommands Commands;
+};
+
+/** \class cmVariableWatchCommand
+ * \brief Watch when the variable changes and invoke command
+ *
+ */
+class cmVariableWatchCommand : public cmCommand
+{
+public:
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone() 
+    {
+    return new cmVariableWatchCommand;
+    }
+
+  //! Default constructor
+  cmVariableWatchCommand();
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  virtual bool InitialPass(std::vector<std::string> const& args);
+
+  /**
+   * This determines if the command is invoked when in script mode.
+   */
+  virtual bool IsScriptable() { return true; }
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual const char* GetName() { return "VARIABLE_WATCH";}
+
+  /**
+   * Succinct documentation.
+   */
+  virtual const char* GetTerseDocumentation() 
+    {
+    return "Watch the CMake variable for change.";
+    }
+  
+  /**
+   * More documentation.
+   */
+  virtual const char* GetFullDocumentation()
+    {
+    return
+      "  VARIABLE_WATCH(<variable name> [<command to execute>])\n"
+      "If the specified variable changes, the message will be printed about "
+      "the variable being changed. If the command is spceified, the command "
+      "will be executed. The command will receive the following arguments:"
+      " COMMAND(<variable> <access> <value> <current list file> <stack>)";
+    }
+  
+  cmTypeMacro(cmVariableWatchCommand, cmCommand);
+
+  void VariableAccessed(const std::string& variable, int access_type,
+    const char* newValue, const cmMakefile* mf);
+
+protected:
+  std::map<std::string, cmVariableWatchCommandHandler> Handlers;
+
+  bool InCallback;
+};
+
+
+#endif
+
+