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diff --git a/Source/cmDefinitions.h b/Source/cmDefinitions.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 cmDefinitions_h
+#define cmDefinitions_h
+
+#include "cmStandardIncludes.h"
+
+#include "cmLinkedTree.h"
+
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+#include <unordered_map>
+#else
+#include "cmsys/hash_map.hxx"
+#endif
+#endif
+
+#include <list>
+
+/** \class cmDefinitions
+ * \brief Store a scope of variable definitions for CMake language.
+ *
+ * This stores the state of variable definitions (set or unset) for
+ * one scope.  Sets are always local.  Gets search parent scopes
+ * transitively and save results locally.
+ */
+class cmDefinitions
+{
+  typedef cmLinkedTree<cmDefinitions>::iterator StackIter;
+public:
+  static const char* Get(const std::string& key,
+                         StackIter begin, StackIter end);
+
+  static void Raise(const std::string& key,
+                    StackIter begin, StackIter end);
+
+  static bool HasKey(const std::string& key,
+                     StackIter begin, StackIter end);
+
+  /** Set (or unset if null) a value associated with a key.  */
+  void Set(const std::string& key, const char* value);
+
+  std::vector<std::string> UnusedKeys() const;
+
+  static std::vector<std::string> ClosureKeys(StackIter begin,
+                                              StackIter end);
+
+  static cmDefinitions MakeClosure(StackIter begin, StackIter end);
+
+private:
+  // String with existence boolean.
+  struct Def: public std::string
+  {
+  private:
+    typedef std::string std_string;
+  public:
+    Def(): std_string(), Exists(false), Used(false) {}
+    Def(const char* v)
+      : std_string(v ? v : ""),
+        Exists(v ? true : false),
+        Used(false)
+    {}
+    Def(const std_string& v): std_string(v), Exists(true), Used(false) {}
+    Def(Def const& d): std_string(d), Exists(d.Exists), Used(d.Used) {}
+    bool Exists;
+    bool Used;
+  };
+  static Def NoDef;
+
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+  typedef std::unordered_map<std::string, Def> MapType;
+#else
+  typedef cmsys::hash_map<std::string, Def> MapType;
+#endif
+#else
+  typedef std::map<std::string, Def> MapType;
+#endif
+  MapType Map;
+
+  static Def const& GetInternal(const std::string& key,
+    StackIter begin, StackIter end, bool raise);
+};
+
+#endif