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diff --git a/src/lib/buildgraph/buildgraphvisitor.h b/src/lib/buildgraph/buildgraphvisitor.h
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+++ b/src/lib/buildgraph/buildgraphvisitor.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_BUILDGRAPHVISITOR_H
+#define QBS_BUILDGRAPHVISITOR_H
+
+namespace qbs {
+namespace Internal {
+
+class Artifact;
+class PhonyTarget;
+class RuleNode;
+
+/*!
+ * \brief The BuildGraphVisitor class
+ *
+ * The return value of a visit method indicates whether the children of the current node
+ * are to be visited next.
+ */
+class BuildGraphVisitor
+{
+public:
+    virtual bool visit(Artifact *) { return true; }
+    virtual bool visit(PhonyTarget *) { return true; }
+    virtual bool visit(RuleNode *) { return true; }
+};
+
+} // namespace Internal
+} // namespace qbs
+
+#endif // QBS_BUILDGRAPHVISITOR_H