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diff --git a/tools/porting/src/preprocessorcontrol.h b/tools/porting/src/preprocessorcontrol.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the qt3to4 porting application of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef PREPROCESSORCONTROL_H
+#define PREPROCESSORCONTROL_H
+
+#include "tokenengine.h"
+#include "tokenizer.h"
+#include "rpplexer.h"
+#include "rpptreeevaluator.h"
+#include "rpp.h"
+#include <QString>
+#include <QStringList>
+#include <QHash>
+
+QT_BEGIN_NAMESPACE
+
+class IncludeFiles
+{
+public:
+    IncludeFiles(const QString &basePath, const QStringList &searchPaths);
+    QString quoteLookup(const QString &currentFile,
+                        const QString &includeFile)const;
+    QString angleBracketLookup(const QString &includeFile) const;
+    QString resolve(const QString &filename) const;
+private:
+    QString searchIncludePaths(const QString &includeFile)const;
+    QStringList m_searchPaths;
+    QString m_basePath;
+};
+
+class PreprocessorCache: public QObject
+{
+Q_OBJECT
+public:
+    PreprocessorCache();
+    TokenEngine::TokenContainer sourceTokens(const QString &filename);
+    Rpp::Source *sourceTree(const QString &filename);
+    bool containsSourceTokens(const QString &filename);
+    bool containsSourceTree(const QString &filename);
+signals:
+    void error(QString type, QString text);
+    void readFile(QByteArray &contents, QString filename);
+private:
+    QByteArray readFile(const QString & filename) const;
+    Tokenizer m_tokenizer;
+    Rpp::RppLexer m_lexer;
+    Rpp::Preprocessor m_preprocessor;
+    TypedPool<Rpp::Item> m_memoryPool;
+    QHash<QString, Rpp::Source *> m_sourceTrees;
+    QHash<QString, TokenEngine::TokenContainer> m_sourceTokens;
+};
+
+class PreprocessorController: public QObject
+{
+Q_OBJECT
+public:
+    PreprocessorController(IncludeFiles includefiles,
+                           PreprocessorCache &preprocessorCache,
+                           QStringList preLoadFilesFilenames = QStringList());
+
+    TokenEngine::TokenSectionSequence evaluate(const QString &filename, Rpp::DefineMap *activedefinitions);
+public slots:
+    void includeSlot(Rpp::Source *&includee, const Rpp::Source *includer,
+         const QString &filename, Rpp::RppTreeEvaluator::IncludeType includeType);
+    void readFile(QByteArray &contents, QString filename);
+signals:
+    void error(QString type, QString text);
+private:
+    IncludeFiles m_includeFiles;
+    Rpp::RppTreeEvaluator m_rppTreeEvaluator;
+    PreprocessorCache &m_preprocessorCache;
+    QHash<QString, QByteArray> m_preLoadFiles;
+};
+
+Rpp::DefineMap *defaultMacros(PreprocessorCache &preprocessorCache);
+
+class StandardOutErrorHandler : public QObject
+{
+Q_OBJECT
+public slots:
+    void error(QString type, QString text);
+};
+
+class RppPreprocessor
+{
+public:
+    RppPreprocessor(QString basePath, QStringList includePaths, QStringList preLoadFilesFilename = QStringList());
+    ~RppPreprocessor();
+    TokenEngine::TokenSectionSequence evaluate(const QString &filename);
+private:
+    IncludeFiles m_includeFiles;
+    PreprocessorCache m_cache;
+    Rpp::DefineMap *m_activeDefinitions;
+    PreprocessorController m_controller;
+    StandardOutErrorHandler m_errorHandler;
+};
+
+QT_END_NAMESPACE
+
+#endif