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diff --git a/Source/cmConditionEvaluator.h b/Source/cmConditionEvaluator.h
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+++ b/Source/cmConditionEvaluator.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2014 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 cmConditionEvaluator_h
+#define cmConditionEvaluator_h
+
+#include "cmCommand.h"
+#include "cmExpandedCommandArgument.h"
+
+#include <list>
+
+class cmConditionEvaluator
+{
+public:
+  typedef std::list<cmExpandedCommandArgument> cmArgumentList;
+
+  cmConditionEvaluator(cmMakefile& makefile, cmListFileContext const& context,
+                       cmListFileBacktrace const& bt);
+
+  // this is a shared function for both If and Else to determine if the
+  // arguments were valid, and if so, was the response true. If there is
+  // an error, the errorString will be set.
+  bool IsTrue(const std::vector<cmExpandedCommandArgument>& args,
+              std::string& errorString, cmake::MessageType& status);
+
+private:
+  // Filter the given variable definition based on policy CMP0054.
+  const char* GetDefinitionIfUnquoted(
+    const cmExpandedCommandArgument& argument) const;
+
+  const char* GetVariableOrString(
+    const cmExpandedCommandArgument& argument) const;
+
+  bool IsKeyword(std::string const& keyword,
+                 cmExpandedCommandArgument& argument) const;
+
+  bool GetBooleanValue(cmExpandedCommandArgument& arg) const;
+
+  bool GetBooleanValueOld(cmExpandedCommandArgument const& arg,
+                          bool one) const;
+
+  bool GetBooleanValueWithAutoDereference(cmExpandedCommandArgument& newArg,
+                                          std::string& errorString,
+                                          cmake::MessageType& status,
+                                          bool oneArg = false) const;
+
+  void IncrementArguments(cmArgumentList& newArgs,
+                          cmArgumentList::iterator& argP1,
+                          cmArgumentList::iterator& argP2) const;
+
+  void HandlePredicate(bool value, int& reducible,
+                       cmArgumentList::iterator& arg, cmArgumentList& newArgs,
+                       cmArgumentList::iterator& argP1,
+                       cmArgumentList::iterator& argP2) const;
+
+  void HandleBinaryOp(bool value, int& reducible,
+                      cmArgumentList::iterator& arg, cmArgumentList& newArgs,
+                      cmArgumentList::iterator& argP1,
+                      cmArgumentList::iterator& argP2);
+
+  bool HandleLevel0(cmArgumentList& newArgs, std::string& errorString,
+                    cmake::MessageType& status);
+
+  bool HandleLevel1(cmArgumentList& newArgs, std::string&,
+                    cmake::MessageType&);
+
+  bool HandleLevel2(cmArgumentList& newArgs, std::string& errorString,
+                    cmake::MessageType& status);
+
+  bool HandleLevel3(cmArgumentList& newArgs, std::string& errorString,
+                    cmake::MessageType& status);
+
+  bool HandleLevel4(cmArgumentList& newArgs, std::string& errorString,
+                    cmake::MessageType& status);
+
+  cmMakefile& Makefile;
+  cmListFileContext ExecutionContext;
+  cmListFileBacktrace Backtrace;
+  cmPolicies::PolicyStatus Policy12Status;
+  cmPolicies::PolicyStatus Policy54Status;
+  cmPolicies::PolicyStatus Policy57Status;
+  cmPolicies::PolicyStatus Policy64Status;
+};
+
+#endif