old_contents: #!/usr/bin/env python
  # 05.12.2005, c
  from __future__ import division, print_function, absolute_import
  
  def configuration(parent_package='',top_path=None):
      from numpy.distutils.misc_util import Configuration
      from numpy.distutils.system_info import get_info, dict_append
  
      config = Configuration('umfpack', parent_package, top_path)
      config.add_data_dir('tests')
  
      umf_info = get_info('umfpack', notfound_action=1)
  
      ## The following addition is needed when linking against a umfpack built
      ## from the latest SparseSuite. Not (strictly) needed when linking against
      ## the version in the ubuntu repositories.
      umf_info['libraries'].insert(0, 'rt')
  
      umfpack_i_file = config.paths('umfpack.i')[0]
  
      def umfpack_i(ext, build_dir):
          if umf_info:
              return umfpack_i_file
  
      blas_info = get_info('blas_opt')
      build_info = {}
      dict_append(build_info, **umf_info)
      dict_append(build_info, **blas_info)
  
      config.add_extension('__umfpack',
                           sources=[umfpack_i],
                           depends=['umfpack.i'],
                           **build_info)
  
      return config
  
  if __name__ == "__main__":
      from numpy.distutils.core import setup
      setup(**configuration(top_path='').todict())
  
new_contents: #!/usr/bin/env python
  # 05.12.2005, c
  from __future__ import division, print_function, absolute_import
  import sys
  
  def configuration(parent_package='',top_path=None):
      from numpy.distutils.misc_util import Configuration
      from numpy.distutils.system_info import get_info, dict_append
  
      config = Configuration('umfpack', parent_package, top_path)
      config.add_data_dir('tests')
  
      umf_info = get_info('umfpack', notfound_action=1)
  
      ## The following addition is needed when linking against a umfpack built
      ## from the latest SparseSuite. Not (strictly) needed when linking against
      ## the version in the ubuntu repositories.
      if not sys.platform == 'darwin':
          umf_info['libraries'].insert(0, 'rt')
  
      umfpack_i_file = config.paths('umfpack.i')[0]
  
      def umfpack_i(ext, build_dir):
          if umf_info:
              return umfpack_i_file
  
      blas_info = get_info('blas_opt')
      build_info = {}
      dict_append(build_info, **umf_info)
      dict_append(build_info, **blas_info)
  
      config.add_extension('__umfpack',
                           sources=[umfpack_i],
                           depends=['umfpack.i'],
                           **build_info)
  
      return config
  
  if __name__ == "__main__":
      from numpy.distutils.core import setup
      setup(**configuration(top_path='').todict())
  
subject: Add handling for building scikit-umfpack on the Mac, which doesn't have the librt file added to the umfpack dependencies.