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diff --git a/src/plugins/madde/maemopackageinstaller.cpp b/src/plugins/madde/maemopackageinstaller.cpp
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+++ b/src/plugins/madde/maemopackageinstaller.cpp
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+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation ([email protected])
+**
+**
+** 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.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at [email protected].
+**
+**************************************************************************/
+
+#include "maemopackageinstaller.h"
+
+#include "maemoglobal.h"
+
+namespace Madde {
+namespace Internal {
+
+MaemoDebianPackageInstaller::MaemoDebianPackageInstaller(QObject *parent)
+    : AbstractRemoteLinuxPackageInstaller(parent)
+{
+    connect(this, SIGNAL(stderrData(QString)), SLOT(handleInstallerErrorOutput(QString)));
+}
+
+void MaemoDebianPackageInstaller::prepareInstallation()
+{
+    m_installerStderr.clear();
+}
+
+QString MaemoDebianPackageInstaller::installCommandLine(const QString &packageFilePath) const
+{
+    return MaemoGlobal::devrootshPath() + QLatin1String(" dpkg -i --no-force-downgrade ")
+        + packageFilePath;
+}
+
+QString MaemoDebianPackageInstaller::cancelInstallationCommandLine() const
+{
+    return QLatin1String("pkill dpkg");
+}
+
+void MaemoDebianPackageInstaller::handleInstallerErrorOutput(const QString &output)
+{
+    m_installerStderr += output;
+}
+
+QString MaemoDebianPackageInstaller::errorString() const
+{
+    if (m_installerStderr.contains(QLatin1String("Will not downgrade"))) {
+        return tr("Installation failed: "
+            "You tried to downgrade a package, which is not allowed.");
+    } else {
+        return QString();
+    }
+}
+
+
+MaemoRpmPackageInstaller::MaemoRpmPackageInstaller(QObject *parent)
+    : AbstractRemoteLinuxPackageInstaller(parent)
+{
+}
+
+QString MaemoRpmPackageInstaller::installCommandLine(const QString &packageFilePath) const
+{
+    // rpm -U does not allow to re-install a package with the same version
+    // number, so we need --replacepkgs. Even then, it inexplicably reports
+    // a conflict if the files are not identical to the installed version,
+    // so we need --replacefiles as well.
+    // TODO: --replacefiles is dangerous. Is there perhaps a way around it
+    // after all?
+    return MaemoGlobal::devrootshPath() + QLatin1String(" rpm -Uhv --replacepkgs --replacefiles ")
+        + packageFilePath;
+}
+
+QString MaemoRpmPackageInstaller::cancelInstallationCommandLine() const
+{
+    return QLatin1String("pkill rpm");
+}
+
+} // namespace Internal
+} // namespace Madde