old_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 Autoconf(AutotoolsPackage):
      """Autoconf -- system configuration part of autotools"""
  
      homepage = 'https://www.gnu.org/software/autoconf/'
      url = 'http://ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.gz'
  
      version('2.69', '82d05e03b93e45f5a39b828dc9c6c29b')
      version('2.62', '6c1f3b3734999035d77da5024aab4fbd')
      version('2.59', 'd4d45eaa1769d45e59dcb131a4af17a0')
      version('2.13', '9de56d4a161a723228220b0f425dc711')
  
      depends_on('m4@1.4.6:',   type='build')
  
      build_directory = 'spack-build'
  
      def _make_executable(self, name):
          return Executable(join_path(self.prefix.bin, name))
  
      def setup_dependent_package(self, module, dependent_spec):
          # Autoconf is very likely to be a build dependency,
          # so we add the tools it provides to the dependent module
          executables = ['autoconf',
                         'autoheader',
                         'autom4te',
                         'autoreconf',
                         'autoscan',
                         'autoupdate',
                         'ifnames']
          for name in executables:
              setattr(module, name, self._make_executable(name))
  
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 Autoconf(AutotoolsPackage):
      """Autoconf -- system configuration part of autotools"""
  
      homepage = 'https://www.gnu.org/software/autoconf/'
      url = 'http://ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.gz'
  
      version('2.69', '82d05e03b93e45f5a39b828dc9c6c29b')
      version('2.62', '6c1f3b3734999035d77da5024aab4fbd')
      version('2.59', 'd4d45eaa1769d45e59dcb131a4af17a0')
      version('2.13', '9de56d4a161a723228220b0f425dc711')
  
      # Note: m4 is not a pure build-time dependency of autoconf. m4 is
      # needed when autoconf runs, not only when autoconf is built.
      depends_on('m4@1.4.6:', type=('build', 'run'))
  
      build_directory = 'spack-build'
  
      def _make_executable(self, name):
          return Executable(join_path(self.prefix.bin, name))
  
      def setup_dependent_package(self, module, dependent_spec):
          # Autoconf is very likely to be a build dependency,
          # so we add the tools it provides to the dependent module
          executables = ['autoconf',
                         'autoheader',
                         'autom4te',
                         'autoreconf',
                         'autoscan',
                         'autoupdate',
                         'ifnames']
          for name in executables:
              setattr(module, name, self._make_executable(name))
  
subject: Correct m4 dependency declaration (#3415)