old_contents: # Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
  # Spack Project Developers. See the top-level COPYRIGHT file for details.
  #
  # SPDX-License-Identifier: (Apache-2.0 OR MIT)
  
  from spack import *
  
  
  class LibcapNg(AutotoolsPackage):
      """Libcap-ng is a library that makes using posix capabilities easier"""
  
      homepage = "https://github.com/stevegrubb/libcap-ng/"
      url      = "https://github.com/stevegrubb/libcap-ng/archive/v0.8.tar.gz"
  
      version('0.8',    sha256='836ea8188ae7c658cdf003e62a241509dd542f3dec5bc40c603f53a5aadaa93f')
      version('0.7.11', sha256='78f32ff282b49b7b91c56d317fb6669df26da332c6fc9462870cec2573352222')
      version('0.7.10', sha256='c3c156a215e5be5430b2f3b8717bbd1afdabe458b6068a8d163e71cefe98fc32')
  
      depends_on('autoconf', type='build')
      depends_on('automake', type='build')
      depends_on('libtool',  type='build')
      depends_on('m4',       type='build')
      depends_on('attr',     type='build')
      depends_on('python',   type=('build', 'run'))
  
new_contents: # Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
  # Spack Project Developers. See the top-level COPYRIGHT file for details.
  #
  # SPDX-License-Identifier: (Apache-2.0 OR MIT)
  
  from spack import *
  
  
  class LibcapNg(AutotoolsPackage):
      """Libcap-ng is a library that makes using posix capabilities easier"""
  
      homepage = "https://github.com/stevegrubb/libcap-ng/"
      url      = "https://github.com/stevegrubb/libcap-ng/archive/v0.8.tar.gz"
  
      version('0.8',    sha256='836ea8188ae7c658cdf003e62a241509dd542f3dec5bc40c603f53a5aadaa93f')
      version('0.7.11', sha256='78f32ff282b49b7b91c56d317fb6669df26da332c6fc9462870cec2573352222')
      version('0.7.10', sha256='c3c156a215e5be5430b2f3b8717bbd1afdabe458b6068a8d163e71cefe98fc32')
  
      depends_on('autoconf', type='build')
      depends_on('automake', type='build')
      depends_on('libtool',  type='build')
      depends_on('m4',       type='build')
      depends_on('attr',     type='build')
      depends_on('swig',     type='build')
      depends_on('python@2.7:',   type=('build', 'link', 'run'), when='+python')
  
      variant('python', default=True, description='Enable python')
  
      extends('python', when='+python')
  
      def setup_build_environment(self, env):
          if self.spec.satisfies('+python'):
              env.set('PYTHON', self.spec['python'].command.path)
  
      def configure_args(self):
          args = []
          spec = self.spec
          if spec.satisfies('+python'):
              if spec.satisfies('^python@3:'):
                  args.extend(['--without-python', '--with-python3'])
              else:
                  args.extend(['--with-python', '--without-python3'])
          else:
              args.extend(['--without-python', '--without-python3'])
          return args
  
subject: fix detect python. (#21162)