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diff --git a/gerbview/class_gbr_screen.h b/gerbview/class_gbr_screen.h
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+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2012-2014 Jean-Pierre Charras  jp.charras at wanadoo.fr
+ * Copyright (C) 1992-2014 KiCad Developers, see change_log.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file class_gbr_screen.h
+ */
+
+#ifndef CLASS_GBR_SCREEN_H_
+#define CLASS_GBR_SCREEN_H_
+
+
+#include <base_units.h>
+#include <class_base_screen.h>
+#include <layers_id_colors_and_visibility.h>
+
+#define ZOOM_FACTOR( x )       ( x * IU_PER_DECIMILS )
+
+
+/* Handle info to display a board */
+class GBR_SCREEN : public BASE_SCREEN
+{
+public:
+    LAYER_NUM m_Active_Layer;
+    /**
+     * Constructor
+     * @param aPageSizeIU is the size of the initial paper page in internal units.
+     */
+    GBR_SCREEN( const wxSize& aPageSizeIU );
+
+    ~GBR_SCREEN();
+
+    GBR_SCREEN* Next() const { return static_cast<GBR_SCREEN*>( Pnext ); }
+
+//    void        SetNextZoom();
+//    void        SetPreviousZoom();
+//    void        SetLastZoom();
+
+    virtual int MilsToIuScalar();
+
+    /**
+     * Function ClearUndoORRedoList
+     * virtual pure in BASE_SCREEN, so it must be defined here
+     */
+    void ClearUndoORRedoList( UNDO_REDO_CONTAINER& aList, int aItemCount = -1 );
+};
+
+
+#endif  // CLASS_GBR_SCREEN_H_