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diff --git a/Source/cmUnsetCommand.h b/Source/cmUnsetCommand.h
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+++ b/Source/cmUnsetCommand.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 cmUnsetCommand_h
+#define cmUnsetCommand_h
+
+#include "cmCommand.h"
+
+/** \class cmUnsetCommand
+ * \brief Unset a CMAKE variable
+ *
+ * cmUnsetCommand unsets or removes a variable.
+ */
+class cmUnsetCommand : public cmCommand
+{
+public:
+  /**
+   * This is a virtual constructor for the command.
+   */
+  cmCommand* Clone() CM_OVERRIDE { return new cmUnsetCommand; }
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  bool InitialPass(std::vector<std::string> const& args,
+                   cmExecutionStatus& status) CM_OVERRIDE;
+
+  /**
+   * This determines if the command is invoked when in script mode.
+   */
+  bool IsScriptable() const CM_OVERRIDE { return true; }
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  std::string GetName() const CM_OVERRIDE { return "unset"; }
+
+  cmTypeMacro(cmUnsetCommand, cmCommand);
+};
+
+#endif