text: import os
  import sys
  
  def configuration(parent_package='', top_path=None):
      from numpy.distutils.misc_util import Configuration
      from numpy.distutils.system_info import get_info, system_info
      config = Configuration('linalg', parent_package, top_path)
  
      config.add_subpackage('tests')
  
      # Configure lapack_lite
  
      src_dir = 'lapack_lite'
      lapack_lite_src = [
          os.path.join(src_dir, 'python_xerbla.c'),
          os.path.join(src_dir, 'f2c_z_lapack.c'),
          os.path.join(src_dir, 'f2c_c_lapack.c'),
          os.path.join(src_dir, 'f2c_d_lapack.c'),
          os.path.join(src_dir, 'f2c_s_lapack.c'),
          os.path.join(src_dir, 'f2c_lapack.c'),
          os.path.join(src_dir, 'f2c_blas.c'),
          os.path.join(src_dir, 'f2c_config.c'),
          os.path.join(src_dir, 'f2c.c'),
      ]
      all_sources = config.paths(lapack_lite_src)
  
      if os.environ.get('NPY_USE_BLAS_ILP64', "0") != "0":
          lapack_info = get_info('lapack_ilp64_opt', 2)
      else:
          lapack_info = get_info('lapack_opt', 0)  # and {}
  
      use_lapack_lite = not lapack_info
  
      if use_lapack_lite:
          # This makes numpy.distutils write the fact that lapack_lite
          # is being used to numpy.__config__
          class numpy_linalg_lapack_lite(system_info):
              def calc_info(self):
                  info = {'language': 'c'}
                  if sys.maxsize > 2**32:
                      # Build lapack-lite in 64-bit integer mode.
                      # The suffix is arbitrary (lapack_lite symbols follow it),
                      # but use the "64_" convention here.
                      info['define_macros'] = [
                          ('HAVE_BLAS_ILP64', None),
                          ('BLAS_SYMBOL_SUFFIX', '64_')
                      ]
                  self.set_info(**info)
  
          lapack_info = numpy_linalg_lapack_lite().get_info(2)
  
      def get_lapack_lite_sources(ext, build_dir):
          if use_lapack_lite:
              print("### Warning:  Using unoptimized lapack ###")
              return all_sources
          else:
              if sys.platform == 'win32':
                  print("### Warning:  python_xerbla.c is disabled ###")
                  return []
              return [all_sources[0]]
  
      config.add_extension(
          'lapack_lite',
          sources=['lapack_litemodule.c', get_lapack_lite_sources],
          depends=['lapack_lite/f2c.h'],
          extra_info=lapack_info,
      )
  
      # umath_linalg module
      config.add_extension(
          '_umath_linalg',
          sources=['umath_linalg.c.src', get_lapack_lite_sources],
          depends=['lapack_lite/f2c.h'],
          extra_info=lapack_info,
          libraries=['npymath'],
      )
      return config
  
  if __name__ == '__main__':
      from numpy.distutils.core import setup
      setup(configuration=configuration)
  