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diff --git a/src/lib/buildgraph/buildgraphnode.h b/src/lib/buildgraph/buildgraphnode.h
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+++ b/src/lib/buildgraph/buildgraphnode.h
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+/****************************************************************************
+**
+** Copyright (C) 2013 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_BUILDGRAPHNODE_H
+#define QBS_BUILDGRAPHNODE_H
+
+#include "nodeset.h"
+#include <language/forward_decls.h>
+#include <tools/persistentobject.h>
+#include <tools/weakpointer.h>
+
+namespace qbs {
+namespace Internal {
+
+class BuildGraphVisitor;
+class TopLevelProject;
+
+class BuildGraphNode : public virtual PersistentObject
+{
+    friend class NodeSet;
+public:
+    virtual ~BuildGraphNode();
+
+    NodeSet parents;
+    NodeSet children;
+    WeakPointer<ResolvedProduct> product;
+
+    enum BuildState
+    {
+        Untouched = 0,
+        Buildable,
+        Building,
+        Built
+    };
+
+    BuildState buildState;                  // Do not serialize. Will be refreshed for every build.
+
+    virtual void accept(BuildGraphVisitor *visitor) = 0;
+    virtual QString toString() const = 0;
+    void connectChild(BuildGraphNode *child);
+
+protected:
+    explicit BuildGraphNode();
+    void acceptChildren(BuildGraphVisitor *visitor);
+    void load(PersistentPool &pool);
+    void store(PersistentPool &pool) const;
+
+    enum Type
+    {
+        ArtifactNodeType,
+        RuleNodeType,
+        PhonyTargetNodeType
+    };
+    virtual Type type() const = 0;
+};
+
+} // namespace Internal
+} // namespace qbs
+
+#endif // QBS_BUILDGRAPHNODE_H