This file is indexed.

/usr/include/liggghts/write_dump.h is in libliggghts-dev 3.0.3+repack-2.

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The actual contents of the file can be viewed below.

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/* -*- c++ -*- ----------------------------------------------------------
   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
   http://lammps.sandia.gov, Sandia National Laboratories
   Steve Plimpton, sjplimp@sandia.gov

   Copyright (2003) Sandia Corporation.  Under the terms of Contract
   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
   certain rights in this software.  This software is distributed under
   the GNU General Public License.

   See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */

#ifdef COMMAND_CLASS

CommandStyle(write_dump,WriteDump)

#else

#ifndef LMP_WRITE_DUMP_H
#define LMP_WRITE_DUMP_H

#include "pointers.h"

namespace LAMMPS_NS {

class WriteDump : protected Pointers {
 public:
  WriteDump(class LAMMPS *lmp) : Pointers(lmp) {};
  void command(int, char **);
};

}

#endif
#endif

/* ERROR/WARNING messages:

E: Illegal ... command

Self-explanatory.  Check the input script syntax and compare to the
documentation for the command.  You can use -echo screen as a
command-line option when running LAMMPS to see the offending line.

E: Must have atom IDs for group2ndx command

There are no atom IDs defined in the system, but they are required
to identify atoms in a gromacs style index file.

E: Cannot open index file for writing

Self-explanatory. Check your filename, permissions, and disk space or quota.

*/