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

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/* ----------------------------------------------------------------------
   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.
------------------------------------------------------------------------- */

/* ERROR/WARNING messages:

E: Neighbor list overflow, boost neigh_modify one

There are too many neighbors of a single atom.  Use the neigh_modify
command to increase the max number of neighbors allowed for one atom.
You may also want to boost the page size.

*/