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/usr/include/geos/indexBintree.h is in libgeos-dev 3.2.2-3ubuntu1.

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/**********************************************************************
 * $Id: indexBintree.h 1820 2006-09-06 16:54:23Z mloskot $
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.refractions.net
 *
 * Copyright (C) 2006 Refractions Research Inc.
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 **********************************************************************/

#ifndef GEOS_INDEXBINTREE_H
#define GEOS_INDEXBINTREE_H

namespace geos {
namespace index { // geos.index

/// Contains classes that implement a Binary Interval Tree index
namespace bintree { // geos.index.bintree

} // namespace geos.index.bintree
} // namespace geos.index
} // namespace geos

#include <geos/index/bintree/Bintree.h>
#include <geos/index/bintree/Interval.h>
//#include <geos/index/bintree/Key.h>
//#include <geos/index/bintree/Node.h>
//#include <geos/index/bintree/NodeBase.h>
//#include <geos/index/bintree/Root.h>

#endif