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diff --git a/Source/cmGeneratorExpression.h b/Source/cmGeneratorExpression.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.
+
+=========================================================================*/
+#include "cmStandardIncludes.h"
+
+#include <stack>
+
+#include <cmsys/RegularExpression.hxx>
+
+class cmMakefile;
+class cmListFileBacktrace;
+
+/** \class cmGeneratorExpression
+ * \brief Evaluate generate-time query expression syntax.
+ *
+ * cmGeneratorExpression instances are used by build system generator
+ * implementations to evaluate the $<> generator expression syntax.
+ * Generator expressions are evaluated just before the generate step
+ * writes strings into the build system.  They have knowledge of the
+ * build configuration which is not available at configure time.
+ */
+class cmGeneratorExpression
+{
+public:
+  /** Construct with an evaluation context and configuration.  */
+  cmGeneratorExpression(cmMakefile* mf, const char* config,
+                        cmListFileBacktrace const& backtrace);
+
+  /** Evaluate generator expressions in a string.  */
+  const char* Process(std::string const& input);
+  const char* Process(const char* input);
+private:
+  cmMakefile* Makefile;
+  const char* Config;
+  cmListFileBacktrace const& Backtrace;
+  std::vector<char> Data;
+  std::stack<size_t> Barriers;
+  cmsys::RegularExpression TargetInfo;
+  bool Evaluate();
+  bool Evaluate(const char* expr, std::string& result);
+  bool EvaluateTargetInfo(std::string& result);
+};