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diff --git a/Source/cmMathCommand.h b/Source/cmMathCommand.h
new file mode 100644
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--- /dev/null
+++ b/Source/cmMathCommand.h
@@ -0,0 +1,76 @@
+/*============================================================================
+  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 cmMathCommand_h
+#define cmMathCommand_h
+
+#include "cmCommand.h"
+
+/// Mathematical expressions: math(EXPR ...) command.
+class cmMathCommand : public cmCommand
+{
+public:
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone() 
+    {
+    return new cmMathCommand;
+    }
+
+  /**
+   * 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; }
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual const char* GetName() const { return "math";}
+
+  /**
+   * Succinct documentation.
+   */
+  virtual const char* GetTerseDocumentation() const
+    {
+    return "Mathematical expressions.";
+    }
+  
+  /**
+   * More documentation.
+   */
+  virtual const char* GetFullDocumentation() const
+    {
+    return
+      "  math(EXPR <output variable> <math expression>)\n"
+      "EXPR evaluates mathematical expression and return result in the "
+      "output variable. Example mathematical expression is "
+      "'5 * ( 10 + 13 )'.  Supported operators are "
+      "+ - * / % | & ^ ~ << >> * / %.  They have the same meaning "
+      " as they do in c code.";
+    }
+  
+  cmTypeMacro(cmMathCommand, cmCommand);
+protected:
+ 
+  bool HandleExprCommand(std::vector<std::string> const& args);
+};
+
+
+#endif
+