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diff --git a/Source/cmVariableRequiresCommand.h b/Source/cmVariableRequiresCommand.h
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+++ b/Source/cmVariableRequiresCommand.h
@@ -0,0 +1,82 @@
+/*============================================================================
+  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 cmVariableRequiresCommand_h
+#define cmVariableRequiresCommand_h
+
+#include "cmCommand.h"
+
+/** \class cmVariableRequiresCommand
+ * \brief Displays a message to the user
+ *
+ */
+class cmVariableRequiresCommand : public cmCommand
+{
+public:
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone() 
+    {
+    return new cmVariableRequiresCommand;
+    }
+
+  /**
+   * 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);
+  
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual const char* GetName() { return "variable_requires";}
+
+  /**
+   * Succinct documentation.
+   */
+  virtual const char* GetTerseDocumentation() 
+    {
+    return "Deprecated. Use the if() command instead.";
+    }
+  
+  /**
+   * More documentation.
+   */
+  virtual const char* GetFullDocumentation()
+    {
+    return
+      "Assert satisfaction of an option's required variables.\n"
+      "  variable_requires(TEST_VARIABLE RESULT_VARIABLE\n"
+      "                    REQUIRED_VARIABLE1\n"
+      "                    REQUIRED_VARIABLE2 ...)\n"
+      "The first argument (TEST_VARIABLE) is the name of the variable to be "
+      "tested, if that variable is false nothing else is done. If "
+      "TEST_VARIABLE is true, then "
+      "the next argument (RESULT_VARIABLE) is a variable that is set to true "
+      "if all the required variables are set. " 
+      "The rest of the arguments are variables that must be true or not "
+      "set to NOTFOUND to avoid an error.  If any are not true, an error "
+      "is reported.";
+    }
+  
+  /** This command is kept for compatibility with older CMake versions. */
+  virtual bool IsDiscouraged()
+    {
+    return true;
+    }
+
+  cmTypeMacro(cmVariableRequiresCommand, cmCommand);
+};
+
+
+#endif