/usr/include/liggghts/dump_vtk.h is in libliggghts-dev 3.7.0+repack1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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    This is the
    ██╗     ██╗ ██████╗  ██████╗  ██████╗ ██╗  ██╗████████╗███████╗
    ██║     ██║██╔════╝ ██╔════╝ ██╔════╝ ██║  ██║╚══██╔══╝██╔════╝
    ██║     ██║██║  ███╗██║  ███╗██║  ███╗███████║   ██║   ███████╗
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    ███████╗██║╚██████╔╝╚██████╔╝╚██████╔╝██║  ██║   ██║   ███████║
    ╚══════╝╚═╝ ╚═════╝  ╚═════╝  ╚═════╝ ╚═╝  ╚═╝   ╚═╝   ╚══════╝®
    DEM simulation engine, released by
    DCS Computing Gmbh, Linz, Austria
    http://www.dcs-computing.com, office@dcs-computing.com
    LIGGGHTS® is part of CFDEM®project:
    http://www.liggghts.com | http://www.cfdem.com
    Core developer and main author:
    Christoph Kloss, christoph.kloss@dcs-computing.com
    LIGGGHTS® is open-source, distributed under the terms of the GNU Public
    License, version 2 or later. It 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. You should have
    received a copy of the GNU General Public License along with LIGGGHTS®.
    If not, see http://www.gnu.org/licenses . See also top-level README
    and LICENSE files.
    LIGGGHTS® and CFDEM® are registered trade marks of DCS Computing GmbH,
    the producer of the LIGGGHTS® software and the CFDEM®coupling software
    See http://www.cfdem.com/terms-trademark-policy for details.
-------------------------------------------------------------------------
    Contributing author and copyright for this file:
    (if not contributing author is listed, this file has been contributed
    by the core developer)
    Arno Mayrhofer (DCS Computing GmbH, Linz)
    Copyright 2017-     DCS Computing GmbH, Linz
------------------------------------------------------------------------- */
#ifdef LAMMPS_VTK
#ifndef LMP_DUMP_VTK_H
#define LMP_DUMP_VTK_H
#include "lammps.h"
#include <vtkSmartPointer.h>
#include <vtkXMLWriter.h>
#include <vtkDataWriter.h>
namespace LAMMPS_NS
{
class DumpVTK
{
public:
    DumpVTK(LAMMPS *lmp);
    int modify_param(int narg, char **arg);
    void setVtkWriterOptions(vtkSmartPointer<vtkXMLWriter> writer);
    void setVtkWriterOptions(vtkSmartPointer<vtkDataWriter> writer);
private:
    enum
    {
        VTK_COMP_ZLIB,
#if VTK_MAJOR_VERSION >= 8
        VTK_COMP_LZ4,
#endif
        VTK_COMP_NONE
    };
    LAMMPS *lmp_;
    int vtk_compressor_;
    bool binary_;
};
}; // namespace
#endif // LMP_DUMP_VTK_H
#endif // LAMMPS_VTK
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