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diff --git a/installerbuilder/libinstaller/qtpatch.cpp b/installerbuilder/libinstaller/qtpatch.cpp
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+++ b/installerbuilder/libinstaller/qtpatch.cpp
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+/**************************************************************************
+**
+** This file is part of Qt SDK**
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).*
+**
+** Contact:  Nokia Corporation qt-info@nokia.com**
+**
+** 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
+**
+** 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 are unsure which license is appropriate for your use, please contact
+** (qt-info@nokia.com).
+**
+**************************************************************************/
+#include "qtpatch.h"
+
+#include "common/utils.h"
+
+#include <QString>
+#include <QStringList>
+#include <QFileInfo>
+#include <QProcess>
+#include <QTextStream>
+#include <QVector>
+#include <QTime>
+#include <QDebug>
+#include <QCoreApplication>
+#include <QByteArrayMatcher>
+
+
+#ifdef Q_OS_WIN
+#include <windows.h> // for Sleep
+#endif
+#ifdef Q_OS_UNIX
+#include <errno.h>
+#include <signal.h>
+#include <time.h>
+#endif
+
+//"anonymous" namespace to make clear that this is only for inside use
+namespace {
+    void sleepCopiedFromQTest(int ms)
+    {
+        if (ms < 0) {
+            return;
+        }
+    #ifdef Q_OS_WIN
+        Sleep(uint(ms));
+    #else
+        struct timespec ts = { ms / 1000, (ms % 1000) * 1000 * 1000 };
+        nanosleep(&ts, NULL);
+    #endif
+    }
+
+    void uiDetachedWait(int ms)
+    {
+        QTime timer;
+        timer.start();
+        do {
+            QCoreApplication::processEvents(QEventLoop::AllEvents, ms);
+            sleepCopiedFromQTest(10);
+        } while (timer.elapsed() < ms);
+    }
+
+
+}//"anonymous" namespace
+
+
+QHash<QString, QByteArray> QtPatch::qmakeValues(const QString & qmakePath, QByteArray * qmakeOutput)
+{
+
+    QHash<QString, QByteArray> qmakeValueHash;
+
+    // in some cases qmake is not runable, because another process is blocking it(filewatcher ...)
+    int waitCount = 0;
+    while (qmakeValueHash.isEmpty() && waitCount < 60) {
+        QFileInfo qmake(qmakePath);
+
+        if (!qmake.exists() || !qmake.isExecutable()) {
+            QInstaller::verbose() << qPrintable( QString(QLatin1String("%1 is not existing or not executable")).arg(qmakePath) ) << std::endl;
+            return qmakeValueHash;
+        }
+
+        QStringList args;
+        args << QLatin1String("-query");
+
+        QProcess process;
+        process.start(qmake.absoluteFilePath(), args, QIODevice::ReadOnly);
+        if (process.waitForFinished(2000)) {
+            if (process.exitStatus() == QProcess::CrashExit) {
+                QInstaller::verbose() << qPrintable( QString(QLatin1String("%1 was crashed")).arg(qmakePath) ) << std::endl;
+                return qmakeValueHash;
+            }
+            QByteArray output = process.readAllStandardOutput();
+            qmakeOutput->append(output);
+            QTextStream stream(&output);
+            while (!stream.atEnd()) {
+                const QString line = stream.readLine();
+                const int index = line.indexOf(QLatin1Char(':'));
+                if (index != -1) {
+                    QString value = line.mid(index+1);
+                    if (value != QLatin1String("**Unknown**") )
+                        qmakeValueHash.insert(line.left(index), value.toUtf8());
+                }
+            }
+        }
+        if (qmakeValueHash.isEmpty()) {
+            ++waitCount;
+            static const int waitTimeInMilliSeconds = 500;
+            uiDetachedWait(waitTimeInMilliSeconds);
+        }
+    } //while (qmakeValueHash.isEmpty() && waitCount < 60)
+    return qmakeValueHash;
+}
+
+bool QtPatch::patchBinaryFile( const QString & fileName,
+                               const QByteArray & oldQtPath,
+                               const QByteArray & newQtPath )
+{
+    QFile file(fileName);
+    if ( !file.exists() ) {
+        QInstaller::verbose() << "qpatch: warning: file `" << qPrintable(fileName) << "' not found" << std::endl;
+        return false;
+    }
+
+    openFileForPatching(&file);
+    if (! file.isOpen()) {
+        QInstaller::verbose() << "qpatch: warning: file `" << qPrintable(fileName) << "' can not open." << std::endl;
+        QInstaller::verbose() << qPrintable(file.errorString()) << std::endl;
+        return false;
+    }
+
+    bool isPatched = patchBinaryFile(&file, oldQtPath, newQtPath);
+
+    file.close();
+    return isPatched;
+}
+
+// device must be open
+bool QtPatch::patchBinaryFile( QIODevice* device,
+                               const QByteArray & oldQtPath,
+                               const QByteArray & newQtPath )
+{
+    if (!(device->openMode() == QIODevice::ReadWrite)) {
+        QInstaller::verbose() << "qpatch: warning: This function needs an open device for writing." << std::endl;
+        return false;
+    }
+    const QByteArray source = device->readAll();
+    device->seek(0);
+
+    int offset = 0;
+    QByteArray overwritePath(newQtPath);
+    if(overwritePath.size() < oldQtPath.size()) {
+        QByteArray fillByteArray(oldQtPath.size() - overwritePath.size(), '\0');
+        overwritePath.append(fillByteArray);
+    }
+
+    QByteArrayMatcher byteArrayMatcher(oldQtPath);
+    forever {
+        offset = byteArrayMatcher.indexIn(source, offset);
+        if(offset == -1)
+            break;
+        device->seek(offset);
+        device->write(overwritePath);
+        offset += overwritePath.size();
+    }
+    device->seek(0); //for next reading we should be at the beginning
+    return true;
+}
+
+bool QtPatch::patchTextFile( const QString & fileName,
+                             const QHash<QByteArray, QByteArray> &searchReplacePairs)
+{
+    QFile file(fileName);
+
+    if (! file.open(QFile::ReadOnly)) {
+        QInstaller::verbose() << "qpatch: warning: Open the file '"
+                              << qPrintable(fileName) << "' stopped: "
+                              << qPrintable(file.errorString()) << std::endl;
+        return false;
+    }
+
+    QByteArray source = file.readAll();
+    file.close();
+
+    qDebug() << Q_FUNC_INFO;
+    QHashIterator<QByteArray, QByteArray> it(searchReplacePairs);
+    while(it.hasNext()) {
+        it.next();
+        qDebug() << "it.key(): " << it.key();
+        qDebug() << "it.value(): " << it.value();
+        source.replace(it.key(), it.value());
+    }
+
+    if (! file.open(QFile::WriteOnly | QFile::Truncate)) {
+        QInstaller::verbose() << "qpatch: error: file `" << qPrintable(fileName) << "' not writable" << std::endl;
+        return false;
+    }
+
+    file.write(source);
+    return true;
+}
+
+
+bool QtPatch::openFileForPatching(QFile* file)
+{
+    if (file->openMode() == QIODevice::NotOpen) {
+        // in some cases the file can not open, because another process is blocking it(filewatcher ...)
+        int waitCount = 0;
+        while (! file->open(QFile::ReadWrite) && waitCount < 60) {
+            ++waitCount;
+            static const int waitTimeInMilliSeconds = 500;
+            uiDetachedWait(waitTimeInMilliSeconds);
+        }
+        return file->openMode() == QFile::ReadWrite;
+    }
+    QInstaller::verbose() << "qpatch: error: File `" << qPrintable(file->fileName()) << "' is open, so it can not open it again." << std::endl;
+    return false;
+}