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diff --git a/src/lib/corelib/tools/weakpointer.h b/src/lib/corelib/tools/weakpointer.h
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+++ b/src/lib/corelib/tools/weakpointer.h
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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Build Suite.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+#ifndef QBS_WEAKPOINTER_H
+#define QBS_WEAKPOINTER_H
+
+#include <QWeakPointer>
+
+namespace qbs {
+namespace Internal {
+
+template<typename T> class WeakPointer : public QWeakPointer<T>
+{
+public:
+    WeakPointer() : QWeakPointer<T>() {}
+    WeakPointer(const QSharedPointer<T> &sharedPointer) : QWeakPointer<T>(sharedPointer) {}
+    template <class X> WeakPointer(const QSharedPointer<X> &sp) : QWeakPointer<T>(sp) { }
+
+
+    operator T*() const { return checkedData(); }
+    T *operator->() const { return checkedData(); }
+    T operator*() const { return *checkedData(); }
+
+private:
+    T *checkedData() const {
+        T * const d = QWeakPointer<T>::data();
+        Q_ASSERT(d); // Calling code is not expecting this situation.
+        return d;
+    }
+};
+
+} // namespace Internal
+} // namespace qbs
+
+#endif // QBS_WEAKPOINTER_H