new_contents: ##############################################################################
  # Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
  # Produced at the Lawrence Livermore National Laboratory.
  #
  # This file is part of Spack.
  # Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
  # LLNL-CODE-647188
  #
  # For details, see https://github.com/llnl/spack
  # Please also see the LICENSE file for our notice and the LGPL.
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU Lesser General Public License (as
  # published by the Free Software Foundation) version 2.1, February 1999.
  #
  # 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 terms and
  # conditions of the GNU Lesser General Public License for more details.
  #
  # You should have received a copy of the GNU Lesser General Public
  # License along with this program; if not, write to the Free Software
  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  ##############################################################################
  from spack import *
  
  
  class Libconfig(AutotoolsPackage):
      """C/C++ Configuration File Library"""
  
      homepage = "http://www.hyperrealm.com/libconfig/"
      url      = "https://github.com/hyperrealm/libconfig/archive/v1.6.tar.gz"
  
      force_autoreconf = True
      # there is currently a build error with version 1.6, see:
      # https://github.com/hyperrealm/libconfig/issues/47
      # version('1.6', '2ccd24b6a2ee39f7ff8a3badfafb6539')
      version('1.5', 'e92a91c2ddf3bf77bea0f5ed7f09e492', preferred=True)
  
      depends_on('m4', type=('build'))
      depends_on('autoconf', type=('build'))
      depends_on('automake', type=('build'))
      depends_on('libtool', type=('build'))
  
subject: Add the libconfig package (#4097)