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 Cscope(AutotoolsPackage):
      """Cscope is a developer's tool for browsing source code."""
  
      homepage = "http://cscope.sourceforge.net/"
      url      = "http://downloads.sourceforge.net/project/cscope/cscope/15.8b/cscope-15.8b.tar.gz"
  
      version('15.8b', '8f9409a238ee313a96f9f87fe0f3b176')
  
      # Can be configured to use flex (not necessary)
      # ./configure --with-flex
  
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 Cscope(AutotoolsPackage):
      """Cscope is a developer's tool for browsing source code."""
  
      homepage = "http://cscope.sourceforge.net/"
      url      = "http://downloads.sourceforge.net/project/cscope/cscope/15.8b/cscope-15.8b.tar.gz"
  
      version('15.8b', '8f9409a238ee313a96f9f87fe0f3b176')
  
      variant('flex', default=False, description="Builds with flex")
  
      depends_on('flex', when='+flex')
  
      def configure_args(self):
          args = []
          if '+flex' in self.spec:
              args.append('--with-flex')
          return args
  
subject: add flex variant to cscope (#3252)