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diff --git a/Source/cmVariableWatchCommand.h b/Source/cmVariableWatchCommand.h
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+++ b/Source/cmVariableWatchCommand.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmVariableWatchCommand_h
+#define cmVariableWatchCommand_h
+
+#include "cmCommand.h"
+
+/** \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();
+
+  //! Destructor.
+  ~cmVariableWatchCommand();
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  virtual bool InitialPass(std::vector<std::string> const& args,
+                           cmExecutionStatus &status);
+
+  /**
+   * This determines if the command is invoked when in script mode.
+   */
+  virtual bool IsScriptable() const { return true; }
+
+  /** This command does not really have a final pass but it needs to
+      stay alive since it owns variable watch callback information. */
+  virtual bool HasFinalPass() const { return true; }
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual std::string GetName() const { return "variable_watch";}
+
+  cmTypeMacro(cmVariableWatchCommand, cmCommand);
+
+protected:
+  std::set<std::string> WatchedVariables;
+};
+
+
+#endif
+
+