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 RBiocgenerics(Package):
      """S4 generic functions needed by many Bioconductor packages."""
  
      homepage = 'https://bioconductor.org/packages/BiocGenerics/'
      version('bioc-3.3',
              git='https://github.com/Bioconductor-mirror/BiocGenerics.git',
              branch='release-3.3')
      version('bioc-3.2',
              git='https://github.com/Bioconductor-mirror/BiocGenerics.git',
              branch='release-3.2')
  
      extends('R')
  
      def install(self, spec, prefix):
          R('CMD', 'INSTALL', '--library=%s' %
            self.module.r_lib_dir, '%s' % self.stage.source_path)
  
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 RBiocgenerics(Package):
      """S4 generic functions needed by many Bioconductor packages."""
  
      homepage = 'https://bioconductor.org/packages/BiocGenerics/'
      version('bioc-3.3',
              git='https://github.com/Bioconductor-mirror/BiocGenerics.git',
              branch='release-3.3')
      version('bioc-3.2',
              git='https://github.com/Bioconductor-mirror/BiocGenerics.git',
              branch='release-3.2')
  
      extends('R')
  
      def validate(self, spec):
          """
          Checks that the version of R is appropriate for the Bioconductor
          version.
          """
          if spec.satisfies('@bioc-3.3'):
              if not spec.satisfies('^R@3.3.0:3.3.9'):
                  raise InstallError('Must use R-3.3 for Bioconductor-3.3')
          elif spec.satisfies('@bioc-3.2'):
              if not spec.satisfies('^R@3.2.0:3.2.9'):
                  raise InstallError('Must use R-3.2 for Bioconductor-3.2')
  
      def install(self, spec, prefix):
          self.validate(spec)
          R('CMD', 'INSTALL', '--library=%s' %
            self.module.r_lib_dir, '%s' % self.stage.source_path)
  
subject: Add validator for bioconductor packages