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diff --git a/Source/cmGeneratorExpressionContext.h b/Source/cmGeneratorExpressionContext.h
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+++ b/Source/cmGeneratorExpressionContext.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2012 Stephen Kelly <steveire@gmail.com>
+
+  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 cmGeneratorExpressionContext_h
+#define cmGeneratorExpressionContext_h
+
+#include "cmListFileCache.h"
+
+#include <set>
+#include <map>
+#include <string>
+
+class cmTarget;
+
+//----------------------------------------------------------------------------
+struct cmGeneratorExpressionContext
+{
+  cmGeneratorExpressionContext(cmMakefile* mf, std::string const& config,
+                               bool quiet, cmTarget const* headTarget,
+                               cmTarget const* currentTarget,
+                               bool evaluateForBuildsystem,
+                               cmListFileBacktrace const& backtrace,
+                               std::string const& language);
+
+
+  cmListFileBacktrace Backtrace;
+  std::set<cmTarget*> DependTargets;
+  std::set<cmTarget const*> AllTargets;
+  std::set<std::string> SeenTargetProperties;
+  std::set<cmTarget const*> SourceSensitiveTargets;
+  std::map<cmTarget const*, std::map<std::string, std::string> >
+                                                          MaxLanguageStandard;
+  cmMakefile *Makefile;
+  std::string Config;
+  std::string Language;
+  cmTarget const* HeadTarget; // The target whose property is being evaluated.
+  cmTarget const* CurrentTarget; // The dependent of HeadTarget which appears
+                                 // directly or indirectly in the property.
+  bool Quiet;
+  bool HadError;
+  bool HadContextSensitiveCondition;
+  bool HadHeadSensitiveCondition;
+  bool EvaluateForBuildsystem;
+};
+
+#endif