code: #!/bin/env python
  """
  This file defines a set of system_info classes for getting
  information about various resources (libraries, library directories,
  include directories, etc.) in the system. Currently, the following
  classes are available:
  
    atlas_info
    atlas_threads_info
    atlas_blas_info
    atlas_blas_threads_info
    lapack_atlas_info
    lapack_atlas_threads_info
    atlas_3_10_info
    atlas_3_10_threads_info
    atlas_3_10_blas_info,
    atlas_3_10_blas_threads_info,
    lapack_atlas_3_10_info
    lapack_atlas_3_10_threads_info
    blas_info
    lapack_info
    openblas_info
    blis_info
    blas_opt_info       # usage recommended
    lapack_opt_info     # usage recommended
    fftw_info,dfftw_info,sfftw_info
    fftw_threads_info,dfftw_threads_info,sfftw_threads_info
    djbfft_info
    x11_info
    lapack_src_info
    blas_src_info
    numpy_info
    numarray_info
    numpy_info
    boost_python_info
    agg2_info
    wx_info
    gdk_pixbuf_xlib_2_info
    gdk_pixbuf_2_info
    gdk_x11_2_info
    gtkp_x11_2_info
    gtkp_2_info
    xft_info
    freetype2_info
    umfpack_info
  
  Usage:
      info_dict = get_info(<name>)
    where <name> is a string 'atlas','x11','fftw','lapack','blas',
    'lapack_src', 'blas_src', etc. For a complete list of allowed names,
    see the definition of get_info() function below.
  
    Returned info_dict is a dictionary which is compatible with
    distutils.setup keyword arguments. If info_dict == {}, then the
    asked resource is not available (system_info could not find it).
  
    Several *_info classes specify an environment variable to specify
    the locations of software. When setting the corresponding environment
    variable to 'None' then the software will be ignored, even when it
    is available in system.
  
  Global parameters:
    system_info.search_static_first - search static libraries (.a)
               in precedence to shared ones (.so, .sl) if enabled.
    system_info.verbosity - output the results to stdout if enabled.
  
  The file 'site.cfg' is looked for in
  
  1) Directory of main setup.py file being run.
  2) Home directory of user running the setup.py file as ~/.numpy-site.cfg
  3) System wide directory (location of this file...)
  
  The first one found is used to get system configuration options The
  format is that used by ConfigParser (i.e., Windows .INI style). The
  section ALL has options that are the default for each section. The
  available sections are fftw, atlas, and x11. Appropriate defaults are
  used if nothing is specified.
  
  The order of finding the locations of resources is the following:
   1. environment variable
   2. section in site.cfg
   3. ALL section in site.cfg
  Only the first complete match is returned.
  
  Example:
  ----------
  [ALL]
  library_dirs = /usr/lib:/usr/local/lib:/opt/lib
  include_dirs = /usr/include:/usr/local/include:/opt/include
  src_dirs = /usr/local/src:/opt/src
  # search static libraries (.a) in preference to shared ones (.so)
  search_static_first = 0
  
  [fftw]
  fftw_libs = rfftw, fftw
  fftw_opt_libs = rfftw_threaded, fftw_threaded
  # if the above aren't found, look for {s,d}fftw_libs and {s,d}fftw_opt_libs
  
  [atlas]
  library_dirs = /usr/lib/3dnow:/usr/lib/3dnow/atlas
  # for overriding the names of the atlas libraries
  atlas_libs = lapack, f77blas, cblas, atlas
  
  [x11]
  library_dirs = /usr/X11R6/lib
  include_dirs = /usr/X11R6/include
  ----------
  
  Authors:
    Pearu Peterson <pearu@cens.ioc.ee>, February 2002
    David M. Cooke <cookedm@physics.mcmaster.ca>, April 2002
  
  Copyright 2002 Pearu Peterson all rights reserved,
  Pearu Peterson <pearu@cens.ioc.ee>
  Permission to use, modify, and distribute this software is given under the
  terms of the NumPy (BSD style) license.  See LICENSE.txt that came with
  this distribution for specifics.
  
  NO WARRANTY IS EXPRESSED OR IMPLIED.  USE AT YOUR OWN RISK.
  
  """
  from __future__ import division, absolute_import, print_function
  
  import sys
  import os
  import re
  import copy
  import warnings
  from glob import glob
  from functools import reduce
  if sys.version_info[0] < 3:
      from ConfigParser import NoOptionError
      from ConfigParser import RawConfigParser as ConfigParser
  else:
      from configparser import NoOptionError
      from configparser import RawConfigParser as ConfigParser
  # It seems that some people are importing ConfigParser from here so is
  # good to keep its class name. Use of RawConfigParser is needed in
  # order to be able to load path names with percent in them, like
  # `feature%2Fcool` which is common on git flow branch names.
  
  from distutils.errors import DistutilsError
  from distutils.dist import Distribution
  import distutils.sysconfig
  from distutils import log
  from distutils.util import get_platform
  
  from numpy.distutils.exec_command import \
      find_executable, exec_command, get_pythonexe
  from numpy.distutils.misc_util import is_sequence, is_string, \
                                        get_shared_lib_extension
  from numpy.distutils.command.config import config as cmd_config
  from numpy.distutils.compat import get_exception
  import distutils.ccompiler
  import tempfile
  import shutil
  
  
  # Determine number of bits
  import platform
  _bits = {'32bit': 32, '64bit': 64}
  platform_bits = _bits[platform.architecture()[0]]
  
  
  def libpaths(paths, bits):
      """Return a list of library paths valid on 32 or 64 bit systems.
  
      Inputs:
        paths : sequence
          A sequence of strings (typically paths)
        bits : int
          An integer, the only valid values are 32 or 64.  A ValueError exception
        is raised otherwise.
  
      Examples:
  
      Consider a list of directories
      >>> paths = ['/usr/X11R6/lib','/usr/X11/lib','/usr/lib']
  
      For a 32-bit platform, this is already valid:
      >>> np.distutils.system_info.libpaths(paths,32)
      ['/usr/X11R6/lib', '/usr/X11/lib', '/usr/lib']
  
      On 64 bits, we prepend the '64' postfix
      >>> np.distutils.system_info.libpaths(paths,64)
      ['/usr/X11R6/lib64', '/usr/X11R6/lib', '/usr/X11/lib64', '/usr/X11/lib',
      '/usr/lib64', '/usr/lib']
      """
      if bits not in (32, 64):
          raise ValueError("Invalid bit size in libpaths: 32 or 64 only")
  
      # Handle 32bit case
      if bits == 32:
          return paths
  
      # Handle 64bit case
      out = []
      for p in paths:
          out.extend([p + '64', p])
  
      return out
  
  
  if sys.platform == 'win32':
      default_lib_dirs = ['C:\\',
                          os.path.join(distutils.sysconfig.EXEC_PREFIX,
                                       'libs')]
      default_runtime_dirs = []
      default_include_dirs = []
      default_src_dirs = ['.']
      default_x11_lib_dirs = []
      default_x11_include_dirs = []
  else:
      default_lib_dirs = libpaths(['/usr/local/lib', '/opt/lib', '/usr/lib',
                                   '/opt/local/lib', '/sw/lib'], platform_bits)
      default_runtime_dirs = []
      default_include_dirs = ['/usr/local/include',
                              '/opt/include', '/usr/include',
                              # path of umfpack under macports
                              '/opt/local/include/ufsparse',
                              '/opt/local/include', '/sw/include',
                              '/usr/include/suitesparse']
      default_src_dirs = ['.', '/usr/local/src', '/opt/src', '/sw/src']
  
      default_x11_lib_dirs = libpaths(['/usr/X11R6/lib', '/usr/X11/lib',
                                       '/usr/lib'], platform_bits)
      default_x11_include_dirs = ['/usr/X11R6/include', '/usr/X11/include',
                                  '/usr/include']
  
      if os.path.exists('/usr/lib/X11'):
          globbed_x11_dir = glob('/usr/lib/*/libX11.so')
          if globbed_x11_dir:
              x11_so_dir = os.path.split(globbed_x11_dir[0])[0]
              default_x11_lib_dirs.extend([x11_so_dir, '/usr/lib/X11'])
              default_x11_include_dirs.extend(['/usr/lib/X11/include',
                                               '/usr/include/X11'])
  
      import subprocess as sp
      tmp = None
      try:
          # Explicitly open/close file to avoid ResourceWarning when
          # tests are run in debug mode Python 3.
          tmp = open(os.devnull, 'w')
          p = sp.Popen(["gcc", "-print-multiarch"], stdout=sp.PIPE,
                  stderr=tmp)
      except (OSError, DistutilsError):
          # OSError if gcc is not installed, or SandboxViolation (DistutilsError
          # subclass) if an old setuptools bug is triggered (see gh-3160).
          pass
      else:
          triplet = str(p.communicate()[0].decode().strip())
          if p.returncode == 0:
              # gcc supports the "-print-multiarch" option
              default_x11_lib_dirs += [os.path.join("/usr/lib/", triplet)]
              default_lib_dirs += [os.path.join("/usr/lib/", triplet)]
      finally:
          if tmp is not None:
              tmp.close()
  
  if os.path.join(sys.prefix, 'lib') not in default_lib_dirs:
      default_lib_dirs.insert(0, os.path.join(sys.prefix, 'lib'))
      default_include_dirs.append(os.path.join(sys.prefix, 'include'))
      default_src_dirs.append(os.path.join(sys.prefix, 'src'))
  
  default_lib_dirs = [_m for _m in default_lib_dirs if os.path.isdir(_m)]
  default_runtime_dirs = [_m for _m in default_runtime_dirs if os.path.isdir(_m)]
  default_include_dirs = [_m for _m in default_include_dirs if os.path.isdir(_m)]
  default_src_dirs = [_m for _m in default_src_dirs if os.path.isdir(_m)]
  
  so_ext = get_shared_lib_extension()
  
  
  def get_standard_file(fname):
      """Returns a list of files named 'fname' from
      1) System-wide directory (directory-location of this module)
      2) Users HOME directory (os.environ['HOME'])
      3) Local directory
      """
      # System-wide file
      filenames = []
      try:
          f = __file__
      except NameError:
          f = sys.argv[0]
      else:
          sysfile = os.path.join(os.path.split(os.path.abspath(f))[0],
                                 fname)
          if os.path.isfile(sysfile):
              filenames.append(sysfile)
  
      # Home directory
      # And look for the user config file
      try:
          f = os.path.expanduser('~')
      except KeyError:
          pass
      else:
          user_file = os.path.join(f, fname)
          if os.path.isfile(user_file):
              filenames.append(user_file)
  
      # Local file
      if os.path.isfile(fname):
          filenames.append(os.path.abspath(fname))
  
      return filenames
  
  
  def get_info(name, notfound_action=0):
      """
      notfound_action:
        0 - do nothing
        1 - display warning message
        2 - raise error
      """
      cl = {'atlas': atlas_info,  # use lapack_opt or blas_opt instead
            'atlas_threads': atlas_threads_info,                # ditto
            'atlas_blas': atlas_blas_info,
            'atlas_blas_threads': atlas_blas_threads_info,
            'lapack_atlas': lapack_atlas_info,  # use lapack_opt instead
            'lapack_atlas_threads': lapack_atlas_threads_info,  # ditto
            'atlas_3_10': atlas_3_10_info,  # use lapack_opt or blas_opt instead
            'atlas_3_10_threads': atlas_3_10_threads_info,                # ditto
            'atlas_3_10_blas': atlas_3_10_blas_info,
            'atlas_3_10_blas_threads': atlas_3_10_blas_threads_info,
            'lapack_atlas_3_10': lapack_atlas_3_10_info,  # use lapack_opt instead
            'lapack_atlas_3_10_threads': lapack_atlas_3_10_threads_info,  # ditto
            'mkl': mkl_info,
            # openblas which may or may not have embedded lapack
            'openblas': openblas_info,          # use blas_opt instead
            # openblas with embedded lapack
            'openblas_lapack': openblas_lapack_info, # use blas_opt instead
            'blis': blis_info,                  # use blas_opt instead
            'lapack_mkl': lapack_mkl_info,      # use lapack_opt instead
            'blas_mkl': blas_mkl_info,          # use blas_opt instead
            'x11': x11_info,
            'fft_opt': fft_opt_info,
            'fftw': fftw_info,
            'fftw2': fftw2_info,
            'fftw3': fftw3_info,
            'dfftw': dfftw_info,
            'sfftw': sfftw_info,
            'fftw_threads': fftw_threads_info,
            'dfftw_threads': dfftw_threads_info,
            'sfftw_threads': sfftw_threads_info,
            'djbfft': djbfft_info,
            'blas': blas_info,                  # use blas_opt instead
            'lapack': lapack_info,              # use lapack_opt instead
            'lapack_src': lapack_src_info,
            'blas_src': blas_src_info,
            'numpy': numpy_info,
            'f2py': f2py_info,
            'Numeric': Numeric_info,
            'numeric': Numeric_info,
            'numarray': numarray_info,
            'numerix': numerix_info,
            'lapack_opt': lapack_opt_info,
            'blas_opt': blas_opt_info,
            'boost_python': boost_python_info,
            'agg2': agg2_info,
            'wx': wx_info,
            'gdk_pixbuf_xlib_2': gdk_pixbuf_xlib_2_info,
            'gdk-pixbuf-xlib-2.0': gdk_pixbuf_xlib_2_info,
            'gdk_pixbuf_2': gdk_pixbuf_2_info,
            'gdk-pixbuf-2.0': gdk_pixbuf_2_info,
            'gdk': gdk_info,
            'gdk_2': gdk_2_info,
            'gdk-2.0': gdk_2_info,
            'gdk_x11_2': gdk_x11_2_info,
            'gdk-x11-2.0': gdk_x11_2_info,
            'gtkp_x11_2': gtkp_x11_2_info,
            'gtk+-x11-2.0': gtkp_x11_2_info,
            'gtkp_2': gtkp_2_info,
            'gtk+-2.0': gtkp_2_info,
            'xft': xft_info,
            'freetype2': freetype2_info,
            'umfpack': umfpack_info,
            'amd': amd_info,
            }.get(name.lower(), system_info)
      return cl().get_info(notfound_action)
  
  
  class NotFoundError(DistutilsError):
      """Some third-party program or library is not found."""
  
  
  class AtlasNotFoundError(NotFoundError):
      """
      Atlas (http://math-atlas.sourceforge.net/) libraries not found.
      Directories to search for the libraries can be specified in the
      numpy/distutils/site.cfg file (section [atlas]) or by setting
      the ATLAS environment variable."""
  
  
  class LapackNotFoundError(NotFoundError):
      """
      Lapack (http://www.netlib.org/lapack/) libraries not found.
      Directories to search for the libraries can be specified in the
      numpy/distutils/site.cfg file (section [lapack]) or by setting
      the LAPACK environment variable."""
  
  
  class LapackSrcNotFoundError(LapackNotFoundError):
      """
      Lapack (http://www.netlib.org/lapack/) sources not found.
      Directories to search for the sources can be specified in the
      numpy/distutils/site.cfg file (section [lapack_src]) or by setting
      the LAPACK_SRC environment variable."""
  
  
  class BlasNotFoundError(NotFoundError):
      """
      Blas (http://www.netlib.org/blas/) libraries not found.
      Directories to search for the libraries can be specified in the
      numpy/distutils/site.cfg file (section [blas]) or by setting
      the BLAS environment variable."""
  
  
  class BlasSrcNotFoundError(BlasNotFoundError):
      """
      Blas (http://www.netlib.org/blas/) sources not found.
      Directories to search for the sources can be specified in the
      numpy/distutils/site.cfg file (section [blas_src]) or by setting
      the BLAS_SRC environment variable."""
  
  
  class FFTWNotFoundError(NotFoundError):
      """
      FFTW (http://www.fftw.org/) libraries not found.
      Directories to search for the libraries can be specified in the
      numpy/distutils/site.cfg file (section [fftw]) or by setting
      the FFTW environment variable."""
  
  
  class DJBFFTNotFoundError(NotFoundError):
      """
      DJBFFT (http://cr.yp.to/djbfft.html) libraries not found.
      Directories to search for the libraries can be specified in the
      numpy/distutils/site.cfg file (section [djbfft]) or by setting
      the DJBFFT environment variable."""
  
  
  class NumericNotFoundError(NotFoundError):
      """
      Numeric (http://www.numpy.org/) module not found.
      Get it from above location, install it, and retry setup.py."""
  
  
  class X11NotFoundError(NotFoundError):
      """X11 libraries not found."""
  
  
  class UmfpackNotFoundError(NotFoundError):
      """
      UMFPACK sparse solver (http://www.cise.ufl.edu/research/sparse/umfpack/)
      not found. Directories to search for the libraries can be specified in the
      numpy/distutils/site.cfg file (section [umfpack]) or by setting
      the UMFPACK environment variable."""
  
  
  class system_info(object):
  
      """ get_info() is the only public method. Don't use others.
      """
      section = 'ALL'
      dir_env_var = None
      search_static_first = 0  # XXX: disabled by default, may disappear in
                              # future unless it is proved to be useful.
      verbosity = 1
      saved_results = {}
  
      notfounderror = NotFoundError
  
      def __init__(self,
                    default_lib_dirs=default_lib_dirs,
                    default_include_dirs=default_include_dirs,
                    verbosity=1,
                    ):
          self.__class__.info = {}
          self.local_prefixes = []
          defaults = {'library_dirs': os.pathsep.join(default_lib_dirs),
                      'include_dirs': os.pathsep.join(default_include_dirs),
                      'runtime_library_dirs': os.pathsep.join(default_runtime_dirs),
                      'rpath': '',
                      'src_dirs': os.pathsep.join(default_src_dirs),
                      'search_static_first': str(self.search_static_first),
                      'extra_compile_args': '', 'extra_link_args': ''}
          self.cp = ConfigParser(defaults)
          self.files = []
          self.files.extend(get_standard_file('.numpy-site.cfg'))
          self.files.extend(get_standard_file('site.cfg'))
          self.parse_config_files()
  
          if self.section is not None:
              self.search_static_first = self.cp.getboolean(
                  self.section, 'search_static_first')
          assert isinstance(self.search_static_first, int)
  
      def parse_config_files(self):
          self.cp.read(self.files)
          if not self.cp.has_section(self.section):
              if self.section is not None:
                  self.cp.add_section(self.section)
  
      def calc_libraries_info(self):
          libs = self.get_libraries()
          dirs = self.get_lib_dirs()
          # The extensions use runtime_library_dirs
          r_dirs = self.get_runtime_lib_dirs()
          # Intrinsic distutils use rpath, we simply append both entries
          # as though they were one entry
          r_dirs.extend(self.get_runtime_lib_dirs(key='rpath'))
          info = {}
          for lib in libs:
              i = self.check_libs(dirs, [lib])
              if i is not None:
                  dict_append(info, **i)
              else:
                  log.info('Library %s was not found. Ignoring' % (lib))
  
              if r_dirs:
                  i = self.check_libs(r_dirs, [lib])
                  if i is not None:
                      # Swap library keywords found to runtime_library_dirs
                      # the libraries are insisting on the user having defined
                      # them using the library_dirs, and not necessarily by
                      # runtime_library_dirs
                      del i['libraries']
                      i['runtime_library_dirs'] = i.pop('library_dirs')
                      dict_append(info, **i)
                  else:
                      log.info('Runtime library %s was not found. Ignoring' % (lib))
  
          return info
  
      def set_info(self, **info):
          if info:
              lib_info = self.calc_libraries_info()
              dict_append(info, **lib_info)
              # Update extra information
              extra_info = self.calc_extra_info()
              dict_append(info, **extra_info)
          self.saved_results[self.__class__.__name__] = info
  
      def has_info(self):
          return self.__class__.__name__ in self.saved_results
  
      def calc_extra_info(self):
          """ Updates the information in the current information with
          respect to these flags:
            extra_compile_args
            extra_link_args
          """
          info = {}
          for key in ['extra_compile_args', 'extra_link_args']:
              # Get values
              opt = self.cp.get(self.section, key)
              if opt:
                  tmp = {key : [opt]}
                  dict_append(info, **tmp)
          return info
  
      def get_info(self, notfound_action=0):
          """ Return a dictonary with items that are compatible
              with numpy.distutils.setup keyword arguments.
          """
          flag = 0
          if not self.has_info():
              flag = 1
              log.info(self.__class__.__name__ + ':')
              if hasattr(self, 'calc_info'):
                  self.calc_info()
              if notfound_action:
                  if not self.has_info():
                      if notfound_action == 1:
                          warnings.warn(self.notfounderror.__doc__)
                      elif notfound_action == 2:
                          raise self.notfounderror(self.notfounderror.__doc__)
                      else:
                          raise ValueError(repr(notfound_action))
  
              if not self.has_info():
                  log.info('  NOT AVAILABLE')
                  self.set_info()
              else:
                  log.info('  FOUND:')
  
          res = self.saved_results.get(self.__class__.__name__)
          if self.verbosity > 0 and flag:
              for k, v in res.items():
                  v = str(v)
                  if k in ['sources', 'libraries'] and len(v) > 270:
                      v = v[:120] + '...\n...\n...' + v[-120:]
                  log.info('    %s = %s', k, v)
              log.info('')
  
          return copy.deepcopy(res)
  
      def get_paths(self, section, key):
          dirs = self.cp.get(section, key).split(os.pathsep)
          env_var = self.dir_env_var
          if env_var:
              if is_sequence(env_var):
                  e0 = env_var[-1]
                  for e in env_var:
                      if e in os.environ:
                          e0 = e
                          break
                  if not env_var[0] == e0:
                      log.info('Setting %s=%s' % (env_var[0], e0))
                  env_var = e0
          if env_var and env_var in os.environ:
              d = os.environ[env_var]
              if d == 'None':
                  log.info('Disabled %s: %s',
                           self.__class__.__name__, '(%s is None)'
                           % (env_var,))
                  return []
              if os.path.isfile(d):
                  dirs = [os.path.dirname(d)] + dirs
                  l = getattr(self, '_lib_names', [])
                  if len(l) == 1:
                      b = os.path.basename(d)
                      b = os.path.splitext(b)[0]
                      if b[:3] == 'lib':
                          log.info('Replacing _lib_names[0]==%r with %r' \
                                % (self._lib_names[0], b[3:]))
                          self._lib_names[0] = b[3:]
              else:
                  ds = d.split(os.pathsep)
                  ds2 = []
                  for d in ds:
                      if os.path.isdir(d):
                          ds2.append(d)
                          for dd in ['include', 'lib']:
                              d1 = os.path.join(d, dd)
                              if os.path.isdir(d1):
                                  ds2.append(d1)
                  dirs = ds2 + dirs
          default_dirs = self.cp.get(self.section, key).split(os.pathsep)
          dirs.extend(default_dirs)
          ret = []
          for d in dirs:
              if len(d) > 0 and not os.path.isdir(d):
                  warnings.warn('Specified path %s is invalid.' % d)
                  continue
  
              if d not in ret:
                  ret.append(d)
  
          log.debug('( %s = %s )', key, ':'.join(ret))
          return ret
  
      def get_lib_dirs(self, key='library_dirs'):
          return self.get_paths(self.section, key)
  
      def get_runtime_lib_dirs(self, key='runtime_library_dirs'):
          path = self.get_paths(self.section, key)
          if path == ['']:
              path = []
          return path
  
      def get_include_dirs(self, key='include_dirs'):
          return self.get_paths(self.section, key)
  
      def get_src_dirs(self, key='src_dirs'):
          return self.get_paths(self.section, key)
  
      def get_libs(self, key, default):
          try:
              libs = self.cp.get(self.section, key)
          except NoOptionError:
              if not default:
                  return []
              if is_string(default):
                  return [default]
              return default
          return [b for b in [a.strip() for a in libs.split(',')] if b]
  
      def get_libraries(self, key='libraries'):
          if hasattr(self, '_lib_names'):
              return self.get_libs(key, default=self._lib_names)
          else:
              return self.get_libs(key, '')
  
      def library_extensions(self):
          static_exts = ['.a']
          if sys.platform == 'win32':
              static_exts.append('.lib')  # .lib is used by MSVC
          if self.search_static_first:
              exts = static_exts + [so_ext]
          else:
              exts = [so_ext] + static_exts
          if sys.platform == 'cygwin':
              exts.append('.dll.a')
          if sys.platform == 'darwin':
              exts.append('.dylib')
          return exts
  
      def check_libs(self, lib_dirs, libs, opt_libs=[]):
          """If static or shared libraries are available then return
          their info dictionary.
  
          Checks for all libraries as shared libraries first, then
          static (or vice versa if self.search_static_first is True).
          """
          exts = self.library_extensions()
          info = None
          for ext in exts:
              info = self._check_libs(lib_dirs, libs, opt_libs, [ext])
              if info is not None:
                  break
          if not info:
              log.info('  libraries %s not found in %s', ','.join(libs),
                       lib_dirs)
          return info
  
      def check_libs2(self, lib_dirs, libs, opt_libs=[]):
          """If static or shared libraries are available then return
          their info dictionary.
  
          Checks each library for shared or static.
          """
          exts = self.library_extensions()
          info = self._check_libs(lib_dirs, libs, opt_libs, exts)
          if not info:
              log.info('  libraries %s not found in %s', ','.join(libs),
                       lib_dirs)
  
          return info
  
      def _find_lib(self, lib_dir, lib, exts):
          assert is_string(lib_dir)
          # under windows first try without 'lib' prefix
          if sys.platform == 'win32':
              lib_prefixes = ['', 'lib']
          else:
              lib_prefixes = ['lib']
          # for each library name, see if we can find a file for it.
          for ext in exts:
              for prefix in lib_prefixes:
                  p = self.combine_paths(lib_dir, prefix + lib + ext)
                  if p:
                      break
              if p:
                  assert len(p) == 1
                  # ??? splitext on p[0] would do this for cygwin
                  # doesn't seem correct
                  if ext == '.dll.a':
                      lib += '.dll'
                  return lib
  
          return False
  
      def _find_libs(self, lib_dirs, libs, exts):
          # make sure we preserve the order of libs, as it can be important
          found_dirs, found_libs = [], []
          for lib in libs:
              for lib_dir in lib_dirs:
                  found_lib = self._find_lib(lib_dir, lib, exts)
                  if found_lib:
                      found_libs.append(found_lib)
                      if lib_dir not in found_dirs:
                          found_dirs.append(lib_dir)
                      break
          return found_dirs, found_libs
  
      def _check_libs(self, lib_dirs, libs, opt_libs, exts):
          """Find mandatory and optional libs in expected paths.
  
          Missing optional libraries are silently forgotten.
          """
          if not is_sequence(lib_dirs):
              lib_dirs = [lib_dirs]
          # First, try to find the mandatory libraries
          found_dirs, found_libs = self._find_libs(lib_dirs, libs, exts)
          if len(found_libs) > 0 and len(found_libs) == len(libs):
              # Now, check for optional libraries
              opt_found_dirs, opt_found_libs = self._find_libs(lib_dirs, opt_libs, exts)
              found_libs.extend(opt_found_libs)
              for lib_dir in opt_found_dirs:
                  if lib_dir not in found_dirs:
                      found_dirs.append(lib_dir)
              info = {'libraries': found_libs, 'library_dirs': found_dirs}
              return info
          else:
              return None
  
      def combine_paths(self, *args):
          """Return a list of existing paths composed by all combinations
          of items from the arguments.
          """
          return combine_paths(*args, **{'verbosity': self.verbosity})
  
  
  class fft_opt_info(system_info):
  
      def calc_info(self):
          info = {}
          fftw_info = get_info('fftw3') or get_info('fftw2') or get_info('dfftw')
          djbfft_info = get_info('djbfft')
          if fftw_info:
              dict_append(info, **fftw_info)
              if djbfft_info:
                  dict_append(info, **djbfft_info)
              self.set_info(**info)
              return
  
  
  class fftw_info(system_info):
      #variables to override
      section = 'fftw'
      dir_env_var = 'FFTW'
      notfounderror = FFTWNotFoundError
      ver_info = [{'name':'fftw3',
                      'libs':['fftw3'],
                      'includes':['fftw3.h'],
                      'macros':[('SCIPY_FFTW3_H', None)]},
                    {'name':'fftw2',
                      'libs':['rfftw', 'fftw'],
                      'includes':['fftw.h', 'rfftw.h'],
                      'macros':[('SCIPY_FFTW_H', None)]}]
  
      def calc_ver_info(self, ver_param):
          """Returns True on successful version detection, else False"""
          lib_dirs = self.get_lib_dirs()
          incl_dirs = self.get_include_dirs()
          incl_dir = None
          libs = self.get_libs(self.section + '_libs', ver_param['libs'])
          info = self.check_libs(lib_dirs, libs)
          if info is not None:
              flag = 0
              for d in incl_dirs:
                  if len(self.combine_paths(d, ver_param['includes'])) \
                     == len(ver_param['includes']):
                      dict_append(info, include_dirs=[d])
                      flag = 1
                      incl_dirs = [d]
                      break
              if flag:
                  dict_append(info, define_macros=ver_param['macros'])
              else:
                  info = None
          if info is not None:
              self.set_info(**info)
              return True
          else:
              log.info('  %s not found' % (ver_param['name']))
              return False
  
      def calc_info(self):
          for i in self.ver_info:
              if self.calc_ver_info(i):
                  break
  
  
  class fftw2_info(fftw_info):
      #variables to override
      section = 'fftw'
      dir_env_var = 'FFTW'
      notfounderror = FFTWNotFoundError
      ver_info = [{'name':'fftw2',
                      'libs':['rfftw', 'fftw'],
                      'includes':['fftw.h', 'rfftw.h'],
                      'macros':[('SCIPY_FFTW_H', None)]}
                    ]
  
  
  class fftw3_info(fftw_info):
      #variables to override
      section = 'fftw3'
      dir_env_var = 'FFTW3'
      notfounderror = FFTWNotFoundError
      ver_info = [{'name':'fftw3',
                      'libs':['fftw3'],
                      'includes':['fftw3.h'],
                      'macros':[('SCIPY_FFTW3_H', None)]},
                    ]
  
  
  class dfftw_info(fftw_info):
      section = 'fftw'
      dir_env_var = 'FFTW'
      ver_info = [{'name':'dfftw',
                      'libs':['drfftw', 'dfftw'],
                      'includes':['dfftw.h', 'drfftw.h'],
                      'macros':[('SCIPY_DFFTW_H', None)]}]
  
  
  class sfftw_info(fftw_info):
      section = 'fftw'
      dir_env_var = 'FFTW'
      ver_info = [{'name':'sfftw',
                      'libs':['srfftw', 'sfftw'],
                      'includes':['sfftw.h', 'srfftw.h'],
                      'macros':[('SCIPY_SFFTW_H', None)]}]
  
  
  class fftw_threads_info(fftw_info):
      section = 'fftw'
      dir_env_var = 'FFTW'
      ver_info = [{'name':'fftw threads',
                      'libs':['rfftw_threads', 'fftw_threads'],
                      'includes':['fftw_threads.h', 'rfftw_threads.h'],
                      'macros':[('SCIPY_FFTW_THREADS_H', None)]}]
  
  
  class dfftw_threads_info(fftw_info):
      section = 'fftw'
      dir_env_var = 'FFTW'
      ver_info = [{'name':'dfftw threads',
                      'libs':['drfftw_threads', 'dfftw_threads'],
                      'includes':['dfftw_threads.h', 'drfftw_threads.h'],
                      'macros':[('SCIPY_DFFTW_THREADS_H', None)]}]
  
  
  class sfftw_threads_info(fftw_info):
      section = 'fftw'
      dir_env_var = 'FFTW'
      ver_info = [{'name':'sfftw threads',
                      'libs':['srfftw_threads', 'sfftw_threads'],
                      'includes':['sfftw_threads.h', 'srfftw_threads.h'],
                      'macros':[('SCIPY_SFFTW_THREADS_H', None)]}]
  
  
  class djbfft_info(system_info):
      section = 'djbfft'
      dir_env_var = 'DJBFFT'
      notfounderror = DJBFFTNotFoundError
  
      def get_paths(self, section, key):
          pre_dirs = system_info.get_paths(self, section, key)
          dirs = []
          for d in pre_dirs:
              dirs.extend(self.combine_paths(d, ['djbfft']) + [d])
          return [d for d in dirs if os.path.isdir(d)]
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
          incl_dirs = self.get_include_dirs()
          info = None
          for d in lib_dirs:
              p = self.combine_paths(d, ['djbfft.a'])
              if p:
                  info = {'extra_objects': p}
                  break
              p = self.combine_paths(d, ['libdjbfft.a', 'libdjbfft' + so_ext])
              if p:
                  info = {'libraries': ['djbfft'], 'library_dirs': [d]}
                  break
          if info is None:
              return
          for d in incl_dirs:
              if len(self.combine_paths(d, ['fftc8.h', 'fftfreq.h'])) == 2:
                  dict_append(info, include_dirs=[d],
                              define_macros=[('SCIPY_DJBFFT_H', None)])
                  self.set_info(**info)
                  return
          return
  
  
  class mkl_info(system_info):
      section = 'mkl'
      dir_env_var = 'MKLROOT'
      _lib_mkl = ['mkl', 'vml', 'guide']
  
      def get_mkl_rootdir(self):
          mklroot = os.environ.get('MKLROOT', None)
          if mklroot is not None:
              return mklroot
          paths = os.environ.get('LD_LIBRARY_PATH', '').split(os.pathsep)
          ld_so_conf = '/etc/ld.so.conf'
          if os.path.isfile(ld_so_conf):
              for d in open(ld_so_conf, 'r'):
                  d = d.strip()
                  if d:
                      paths.append(d)
          intel_mkl_dirs = []
          for path in paths:
              path_atoms = path.split(os.sep)
              for m in path_atoms:
                  if m.startswith('mkl'):
                      d = os.sep.join(path_atoms[:path_atoms.index(m) + 2])
                      intel_mkl_dirs.append(d)
                      break
          for d in paths:
              dirs = glob(os.path.join(d, 'mkl', '*'))
              dirs += glob(os.path.join(d, 'mkl*'))
              for d in dirs:
                  if os.path.isdir(os.path.join(d, 'lib')):
                      return d
          return None
  
      def __init__(self):
          mklroot = self.get_mkl_rootdir()
          if mklroot is None:
              system_info.__init__(self)
          else:
              from .cpuinfo import cpu
              l = 'mkl'  # use shared library
              if cpu.is_Itanium():
                  plt = '64'
              elif cpu.is_Xeon():
                  plt = 'intel64'
              else:
                  plt = '32'
              if l not in self._lib_mkl:
                  self._lib_mkl.insert(0, l)
              system_info.__init__(
                  self,
                  default_lib_dirs=[os.path.join(mklroot, 'lib', plt)],
                  default_include_dirs=[os.path.join(mklroot, 'include')])
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
          incl_dirs = self.get_include_dirs()
          mkl_libs = self.get_libs('mkl_libs', self._lib_mkl)
          info = self.check_libs2(lib_dirs, mkl_libs)
          if info is None:
              return
          dict_append(info,
                      define_macros=[('SCIPY_MKL_H', None),
                                     ('HAVE_CBLAS', None)],
                      include_dirs=incl_dirs)
          if sys.platform == 'win32':
              pass  # win32 has no pthread library
          else:
              dict_append(info, libraries=['pthread'])
          self.set_info(**info)
  
  
  class lapack_mkl_info(mkl_info):
  
      def calc_info(self):
          mkl = get_info('mkl')
          if not mkl:
              return
          if sys.platform == 'win32':
              lapack_libs = self.get_libs('lapack_libs', ['mkl_lapack'])
          else:
              lapack_libs = self.get_libs('lapack_libs',
                                          ['mkl_lapack32', 'mkl_lapack64'])
  
          info = {'libraries': lapack_libs}
          dict_append(info, **mkl)
          self.set_info(**info)
  
  
  class blas_mkl_info(mkl_info):
      pass
  
  
  class atlas_info(system_info):
      section = 'atlas'
      dir_env_var = 'ATLAS'
      _lib_names = ['f77blas', 'cblas']
      if sys.platform[:7] == 'freebsd':
          _lib_atlas = ['atlas_r']
          _lib_lapack = ['alapack_r']
      else:
          _lib_atlas = ['atlas']
          _lib_lapack = ['lapack']
  
      notfounderror = AtlasNotFoundError
  
      def get_paths(self, section, key):
          pre_dirs = system_info.get_paths(self, section, key)
          dirs = []
          for d in pre_dirs:
              dirs.extend(self.combine_paths(d, ['atlas*', 'ATLAS*',
                                           'sse', '3dnow', 'sse2']) + [d])
          return [d for d in dirs if os.path.isdir(d)]
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
          info = {}
          atlas_libs = self.get_libs('atlas_libs',
                                     self._lib_names + self._lib_atlas)
          lapack_libs = self.get_libs('lapack_libs', self._lib_lapack)
          atlas = None
          lapack = None
          atlas_1 = None
          for d in lib_dirs:
              atlas = self.check_libs2(d, atlas_libs, [])
              lapack_atlas = self.check_libs2(d, ['lapack_atlas'], [])
              if atlas is not None:
                  lib_dirs2 = [d] + self.combine_paths(d, ['atlas*', 'ATLAS*'])
                  lapack = self.check_libs2(lib_dirs2, lapack_libs, [])
                  if lapack is not None:
                      break
              if atlas:
                  atlas_1 = atlas
          log.info(self.__class__)
          if atlas is None:
              atlas = atlas_1
          if atlas is None:
              return
          include_dirs = self.get_include_dirs()
          h = (self.combine_paths(lib_dirs + include_dirs, 'cblas.h') or [None])
          h = h[0]
          if h:
              h = os.path.dirname(h)
              dict_append(info, include_dirs=[h])
          info['language'] = 'c'
          if lapack is not None:
              dict_append(info, **lapack)
              dict_append(info, **atlas)
          elif 'lapack_atlas' in atlas['libraries']:
              dict_append(info, **atlas)
              dict_append(info,
                          define_macros=[('ATLAS_WITH_LAPACK_ATLAS', None)])
              self.set_info(**info)
              return
          else:
              dict_append(info, **atlas)
              dict_append(info, define_macros=[('ATLAS_WITHOUT_LAPACK', None)])
              message = """
  *********************************************************************
      Could not find lapack library within the ATLAS installation.
  *********************************************************************
  """
              warnings.warn(message)
              self.set_info(**info)
              return
  
          # Check if lapack library is complete, only warn if it is not.
          lapack_dir = lapack['library_dirs'][0]
          lapack_name = lapack['libraries'][0]
          lapack_lib = None
          lib_prefixes = ['lib']
          if sys.platform == 'win32':
              lib_prefixes.append('')
          for e in self.library_extensions():
              for prefix in lib_prefixes:
                  fn = os.path.join(lapack_dir, prefix + lapack_name + e)
                  if os.path.exists(fn):
                      lapack_lib = fn
                      break
              if lapack_lib:
                  break
          if lapack_lib is not None:
              sz = os.stat(lapack_lib)[6]
              if sz <= 4000 * 1024:
                  message = """
  *********************************************************************
      Lapack library (from ATLAS) is probably incomplete:
        size of %s is %sk (expected >4000k)
  
      Follow the instructions in the KNOWN PROBLEMS section of the file
      numpy/INSTALL.txt.
  *********************************************************************
  """ % (lapack_lib, sz / 1024)
                  warnings.warn(message)
              else:
                  info['language'] = 'f77'
  
          atlas_version, atlas_extra_info = get_atlas_version(**atlas)
          dict_append(info, **atlas_extra_info)
  
          self.set_info(**info)
  
  
  class atlas_blas_info(atlas_info):
      _lib_names = ['f77blas', 'cblas']
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
          info = {}
          atlas_libs = self.get_libs('atlas_libs',
                                     self._lib_names + self._lib_atlas)
          atlas = self.check_libs2(lib_dirs, atlas_libs, [])
          if atlas is None:
              return
          include_dirs = self.get_include_dirs()
          h = (self.combine_paths(lib_dirs + include_dirs, 'cblas.h') or [None])
          h = h[0]
          if h:
              h = os.path.dirname(h)
              dict_append(info, include_dirs=[h])
          info['language'] = 'c'
          info['define_macros'] = [('HAVE_CBLAS', None)]
  
          atlas_version, atlas_extra_info = get_atlas_version(**atlas)
          dict_append(atlas, **atlas_extra_info)
  
          dict_append(info, **atlas)
  
          self.set_info(**info)
          return
  
  
  class atlas_threads_info(atlas_info):
      dir_env_var = ['PTATLAS', 'ATLAS']
      _lib_names = ['ptf77blas', 'ptcblas']
  
  
  class atlas_blas_threads_info(atlas_blas_info):
      dir_env_var = ['PTATLAS', 'ATLAS']
      _lib_names = ['ptf77blas', 'ptcblas']
  
  
  class lapack_atlas_info(atlas_info):
      _lib_names = ['lapack_atlas'] + atlas_info._lib_names
  
  
  class lapack_atlas_threads_info(atlas_threads_info):
      _lib_names = ['lapack_atlas'] + atlas_threads_info._lib_names
  
  
  class atlas_3_10_info(atlas_info):
      _lib_names = ['satlas']
      _lib_atlas = _lib_names
      _lib_lapack = _lib_names
  
  
  class atlas_3_10_blas_info(atlas_3_10_info):
      _lib_names = ['satlas']
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
          info = {}
          atlas_libs = self.get_libs('atlas_libs',
                                     self._lib_names)
          atlas = self.check_libs2(lib_dirs, atlas_libs, [])
          if atlas is None:
              return
          include_dirs = self.get_include_dirs()
          h = (self.combine_paths(lib_dirs + include_dirs, 'cblas.h') or [None])
          h = h[0]
          if h:
              h = os.path.dirname(h)
              dict_append(info, include_dirs=[h])
          info['language'] = 'c'
          info['define_macros'] = [('HAVE_CBLAS', None)]
  
          atlas_version, atlas_extra_info = get_atlas_version(**atlas)
          dict_append(atlas, **atlas_extra_info)
  
          dict_append(info, **atlas)
  
          self.set_info(**info)
          return
  
  
  class atlas_3_10_threads_info(atlas_3_10_info):
      dir_env_var = ['PTATLAS', 'ATLAS']
      _lib_names = ['tatlas']
      _lib_atlas = _lib_names
      _lib_lapack = _lib_names
  
  
  class atlas_3_10_blas_threads_info(atlas_3_10_blas_info):
      dir_env_var = ['PTATLAS', 'ATLAS']
      _lib_names = ['tatlas']
  
  
  class lapack_atlas_3_10_info(atlas_3_10_info):
      pass
  
  
  class lapack_atlas_3_10_threads_info(atlas_3_10_threads_info):
      pass
  
  
  class lapack_info(system_info):
      section = 'lapack'
      dir_env_var = 'LAPACK'
      _lib_names = ['lapack']
      notfounderror = LapackNotFoundError
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
  
          lapack_libs = self.get_libs('lapack_libs', self._lib_names)
          info = self.check_libs(lib_dirs, lapack_libs, [])
          if info is None:
              return
          info['language'] = 'f77'
          self.set_info(**info)
  
  
  class lapack_src_info(system_info):
      section = 'lapack_src'
      dir_env_var = 'LAPACK_SRC'
      notfounderror = LapackSrcNotFoundError
  
      def get_paths(self, section, key):
          pre_dirs = system_info.get_paths(self, section, key)
          dirs = []
          for d in pre_dirs:
              dirs.extend([d] + self.combine_paths(d, ['LAPACK*/SRC', 'SRC']))
          return [d for d in dirs if os.path.isdir(d)]
  
      def calc_info(self):
          src_dirs = self.get_src_dirs()
          src_dir = ''
          for d in src_dirs:
              if os.path.isfile(os.path.join(d, 'dgesv.f')):
                  src_dir = d
                  break
          if not src_dir:
              #XXX: Get sources from netlib. May be ask first.
              return
          # The following is extracted from LAPACK-3.0/SRC/Makefile.
          # Added missing names from lapack-lite-3.1.1/SRC/Makefile
          # while keeping removed names for Lapack-3.0 compatibility.
          allaux = '''
          ilaenv ieeeck lsame lsamen xerbla
          iparmq
          '''  # *.f
          laux = '''
          bdsdc bdsqr disna labad lacpy ladiv lae2 laebz laed0 laed1
          laed2 laed3 laed4 laed5 laed6 laed7 laed8 laed9 laeda laev2
          lagtf lagts lamch lamrg lanst lapy2 lapy3 larnv larrb larre
          larrf lartg laruv las2 lascl lasd0 lasd1 lasd2 lasd3 lasd4
          lasd5 lasd6 lasd7 lasd8 lasd9 lasda lasdq lasdt laset lasq1
          lasq2 lasq3 lasq4 lasq5 lasq6 lasr lasrt lassq lasv2 pttrf
          stebz stedc steqr sterf
  
          larra larrc larrd larr larrk larrj larrr laneg laisnan isnan
          lazq3 lazq4
          '''  # [s|d]*.f
          lasrc = '''
          gbbrd gbcon gbequ gbrfs gbsv gbsvx gbtf2 gbtrf gbtrs gebak
          gebal gebd2 gebrd gecon geequ gees geesx geev geevx gegs gegv
          gehd2 gehrd gelq2 gelqf gels gelsd gelss gelsx gelsy geql2
          geqlf geqp3 geqpf geqr2 geqrf gerfs gerq2 gerqf gesc2 gesdd
          gesv gesvd gesvx getc2 getf2 getrf getri getrs ggbak ggbal
          gges ggesx ggev ggevx ggglm gghrd gglse ggqrf ggrqf ggsvd
          ggsvp gtcon gtrfs gtsv gtsvx gttrf gttrs gtts2 hgeqz hsein
          hseqr labrd lacon laein lags2 lagtm lahqr lahrd laic1 lals0
          lalsa lalsd langb lange langt lanhs lansb lansp lansy lantb
          lantp lantr lapll lapmt laqgb laqge laqp2 laqps laqsb laqsp
          laqsy lar1v lar2v larf larfb larfg larft larfx largv larrv
          lartv larz larzb larzt laswp lasyf latbs latdf latps latrd
          latrs latrz latzm lauu2 lauum pbcon pbequ pbrfs pbstf pbsv
          pbsvx pbtf2 pbtrf pbtrs pocon poequ porfs posv posvx potf2
          potrf potri potrs ppcon ppequ pprfs ppsv ppsvx pptrf pptri
          pptrs ptcon pteqr ptrfs ptsv ptsvx pttrs ptts2 spcon sprfs
          spsv spsvx sptrf sptri sptrs stegr stein sycon syrfs sysv
          sysvx sytf2 sytrf sytri sytrs tbcon tbrfs tbtrs tgevc tgex2
          tgexc tgsen tgsja tgsna tgsy2 tgsyl tpcon tprfs tptri tptrs
          trcon trevc trexc trrfs trsen trsna trsyl trti2 trtri trtrs
          tzrqf tzrzf
  
          lacn2 lahr2 stemr laqr0 laqr1 laqr2 laqr3 laqr4 laqr5
          '''  # [s|c|d|z]*.f
          sd_lasrc = '''
          laexc lag2 lagv2 laln2 lanv2 laqtr lasy2 opgtr opmtr org2l
          org2r orgbr orghr orgl2 orglq orgql orgqr orgr2 orgrq orgtr
          orm2l orm2r ormbr ormhr orml2 ormlq ormql ormqr ormr2 ormr3
          ormrq ormrz ormtr rscl sbev sbevd sbevx sbgst sbgv sbgvd sbgvx
          sbtrd spev spevd spevx spgst spgv spgvd spgvx sptrd stev stevd
          stevr stevx syev syevd syevr syevx sygs2 sygst sygv sygvd
          sygvx sytd2 sytrd
          '''  # [s|d]*.f
          cz_lasrc = '''
          bdsqr hbev hbevd hbevx hbgst hbgv hbgvd hbgvx hbtrd hecon heev
          heevd heevr heevx hegs2 hegst hegv hegvd hegvx herfs hesv
          hesvx hetd2 hetf2 hetrd hetrf hetri hetrs hpcon hpev hpevd
          hpevx hpgst hpgv hpgvd hpgvx hprfs hpsv hpsvx hptrd hptrf
          hptri hptrs lacgv lacp2 lacpy lacrm lacrt ladiv laed0 laed7
          laed8 laesy laev2 lahef lanhb lanhe lanhp lanht laqhb laqhe
          laqhp larcm larnv lartg lascl laset lasr lassq pttrf rot spmv
          spr stedc steqr symv syr ung2l ung2r ungbr unghr ungl2 unglq
          ungql ungqr ungr2 ungrq ungtr unm2l unm2r unmbr unmhr unml2
          unmlq unmql unmqr unmr2 unmr3 unmrq unmrz unmtr upgtr upmtr
          '''  # [c|z]*.f
          #######
          sclaux = laux + ' econd '                  # s*.f
          dzlaux = laux + ' secnd '                  # d*.f
          slasrc = lasrc + sd_lasrc                  # s*.f
          dlasrc = lasrc + sd_lasrc                  # d*.f
          clasrc = lasrc + cz_lasrc + ' srot srscl '  # c*.f
          zlasrc = lasrc + cz_lasrc + ' drot drscl '  # z*.f
          oclasrc = ' icmax1 scsum1 '                # *.f
          ozlasrc = ' izmax1 dzsum1 '                # *.f
          sources = ['s%s.f' % f for f in (sclaux + slasrc).split()] \
                    + ['d%s.f' % f for f in (dzlaux + dlasrc).split()] \
                    + ['c%s.f' % f for f in (clasrc).split()] \
                    + ['z%s.f' % f for f in (zlasrc).split()] \
                    + ['%s.f' % f for f in (allaux + oclasrc + ozlasrc).split()]
          sources = [os.path.join(src_dir, f) for f in sources]
          # Lapack 3.1:
          src_dir2 = os.path.join(src_dir, '..', 'INSTALL')
          sources += [os.path.join(src_dir2, p + 'lamch.f') for p in 'sdcz']
          # Lapack 3.2.1:
          sources += [os.path.join(src_dir, p + 'larfp.f') for p in 'sdcz']
          sources += [os.path.join(src_dir, 'ila' + p + 'lr.f') for p in 'sdcz']
          sources += [os.path.join(src_dir, 'ila' + p + 'lc.f') for p in 'sdcz']
          # Should we check here actual existence of source files?
          # Yes, the file listing is different between 3.0 and 3.1
          # versions.
          sources = [f for f in sources if os.path.isfile(f)]
          info = {'sources': sources, 'language': 'f77'}
          self.set_info(**info)
  
  atlas_version_c_text = r'''
  /* This file is generated from numpy/distutils/system_info.py */
  void ATL_buildinfo(void);
  int main(void) {
    ATL_buildinfo();
    return 0;
  }
  '''
  
  _cached_atlas_version = {}
  
  
  def get_atlas_version(**config):
      libraries = config.get('libraries', [])
      library_dirs = config.get('library_dirs', [])
      key = (tuple(libraries), tuple(library_dirs))
      if key in _cached_atlas_version:
          return _cached_atlas_version[key]
      c = cmd_config(Distribution())
      atlas_version = None
      info = {}
      try:
          s, o = c.get_output(atlas_version_c_text,
                              libraries=libraries, library_dirs=library_dirs,
                              use_tee=(system_info.verbosity > 0))
          if s and re.search(r'undefined reference to `_gfortran', o, re.M):
              s, o = c.get_output(atlas_version_c_text,
                                  libraries=libraries + ['gfortran'],
                                  library_dirs=library_dirs,
                                  use_tee=(system_info.verbosity > 0))
              if not s:
                  warnings.warn("""
  *****************************************************
  Linkage with ATLAS requires gfortran. Use
  
    python setup.py config_fc --fcompiler=gnu95 ...
  
  when building extension libraries that use ATLAS.
  Make sure that -lgfortran is used for C++ extensions.
  *****************************************************
  """)
                  dict_append(info, language='f90',
                              define_macros=[('ATLAS_REQUIRES_GFORTRAN', None)])
      except Exception:  # failed to get version from file -- maybe on Windows
          # look at directory name
          for o in library_dirs:
              m = re.search(r'ATLAS_(?P<version>\d+[.]\d+[.]\d+)_', o)
              if m:
                  atlas_version = m.group('version')
              if atlas_version is not None:
                  break
  
          # final choice --- look at ATLAS_VERSION environment
          #   variable
          if atlas_version is None:
              atlas_version = os.environ.get('ATLAS_VERSION', None)
          if atlas_version:
              dict_append(info, define_macros=[(
                  'ATLAS_INFO', '"\\"%s\\""' % atlas_version)
              ])
          else:
              dict_append(info, define_macros=[('NO_ATLAS_INFO', -1)])
          return atlas_version or '?.?.?', info
  
      if not s:
          m = re.search(r'ATLAS version (?P<version>\d+[.]\d+[.]\d+)', o)
          if m:
              atlas_version = m.group('version')
      if atlas_version is None:
          if re.search(r'undefined symbol: ATL_buildinfo', o, re.M):
              atlas_version = '3.2.1_pre3.3.6'
          else:
              log.info('Status: %d', s)
              log.info('Output: %s', o)
  
      if atlas_version == '3.2.1_pre3.3.6':
          dict_append(info, define_macros=[('NO_ATLAS_INFO', -2)])
      else:
          dict_append(info, define_macros=[(
              'ATLAS_INFO', '"\\"%s\\""' % atlas_version)
          ])
      result = _cached_atlas_version[key] = atlas_version, info
      return result
  
  
  class lapack_opt_info(system_info):
  
      notfounderror = LapackNotFoundError
  
      def calc_info(self):
  
          lapack_mkl_info = get_info('lapack_mkl')
          if lapack_mkl_info:
              self.set_info(**lapack_mkl_info)
              return
  
          openblas_info = get_info('openblas_lapack')
          if openblas_info:
              self.set_info(**openblas_info)
              return
  
          atlas_info = get_info('atlas_3_10_threads')
          if not atlas_info:
              atlas_info = get_info('atlas_3_10')
          if not atlas_info:
              atlas_info = get_info('atlas_threads')
          if not atlas_info:
              atlas_info = get_info('atlas')
  
          if sys.platform == 'darwin' and not atlas_info:
              # Use the system lapack from Accelerate or vecLib under OSX
              args = []
              link_args = []
              if get_platform()[-4:] == 'i386' or 'intel' in get_platform() or \
                 'x86_64' in get_platform() or \
                 'i386' in platform.platform():
                  intel = 1
              else:
                  intel = 0
              if os.path.exists('/System/Library/Frameworks'
                                '/Accelerate.framework/'):
                  if intel:
                      args.extend(['-msse3'])
                  else:
                      args.extend(['-faltivec'])
                  link_args.extend(['-Wl,-framework', '-Wl,Accelerate'])
              elif os.path.exists('/System/Library/Frameworks'
                                  '/vecLib.framework/'):
                  if intel:
                      args.extend(['-msse3'])
                  else:
                      args.extend(['-faltivec'])
                  link_args.extend(['-Wl,-framework', '-Wl,vecLib'])
              if args:
                  self.set_info(extra_compile_args=args,
                                extra_link_args=link_args,
                                define_macros=[('NO_ATLAS_INFO', 3),
                                               ('HAVE_CBLAS', None)])
                  return
  
          need_lapack = 0
          need_blas = 0
          info = {}
          if atlas_info:
              l = atlas_info.get('define_macros', [])
              if ('ATLAS_WITH_LAPACK_ATLAS', None) in l \
                     or ('ATLAS_WITHOUT_LAPACK', None) in l:
                  need_lapack = 1
              info = atlas_info
  
          else:
              warnings.warn(AtlasNotFoundError.__doc__)
              need_blas = 1
              need_lapack = 1
              dict_append(info, define_macros=[('NO_ATLAS_INFO', 1)])
  
          if need_lapack:
              lapack_info = get_info('lapack')
              #lapack_info = {} ## uncomment for testing
              if lapack_info:
                  dict_append(info, **lapack_info)
              else:
                  warnings.warn(LapackNotFoundError.__doc__)
                  lapack_src_info = get_info('lapack_src')
                  if not lapack_src_info:
                      warnings.warn(LapackSrcNotFoundError.__doc__)
                      return
                  dict_append(info, libraries=[('flapack_src', lapack_src_info)])
  
          if need_blas:
              blas_info = get_info('blas')
              if blas_info:
                  dict_append(info, **blas_info)
              else:
                  warnings.warn(BlasNotFoundError.__doc__)
                  blas_src_info = get_info('blas_src')
                  if not blas_src_info:
                      warnings.warn(BlasSrcNotFoundError.__doc__)
                      return
                  dict_append(info, libraries=[('fblas_src', blas_src_info)])
  
          self.set_info(**info)
          return
  
  
  class blas_opt_info(system_info):
  
      notfounderror = BlasNotFoundError
  
      def calc_info(self):
  
          blas_mkl_info = get_info('blas_mkl')
          if blas_mkl_info:
              self.set_info(**blas_mkl_info)
              return
  
          blis_info = get_info('blis')
          if blis_info:
              self.set_info(**blis_info)
              return
  
          openblas_info = get_info('openblas')
          if openblas_info:
              self.set_info(**openblas_info)
              return
  
          atlas_info = get_info('atlas_3_10_blas_threads')
          if not atlas_info:
              atlas_info = get_info('atlas_3_10_blas')
          if not atlas_info:
              atlas_info = get_info('atlas_blas_threads')
          if not atlas_info:
              atlas_info = get_info('atlas_blas')
  
          if sys.platform == 'darwin' and not atlas_info:
              # Use the system BLAS from Accelerate or vecLib under OSX
              args = []
              link_args = []
              if get_platform()[-4:] == 'i386' or 'intel' in get_platform() or \
                 'x86_64' in get_platform() or \
                 'i386' in platform.platform():
                  intel = 1
              else:
                  intel = 0
              if os.path.exists('/System/Library/Frameworks'
                                '/Accelerate.framework/'):
                  if intel:
                      args.extend(['-msse3'])
                  else:
                      args.extend(['-faltivec'])
                  args.extend([
                      '-I/System/Library/Frameworks/vecLib.framework/Headers'])
                  link_args.extend(['-Wl,-framework', '-Wl,Accelerate'])
              elif os.path.exists('/System/Library/Frameworks'
                                  '/vecLib.framework/'):
                  if intel:
                      args.extend(['-msse3'])
                  else:
                      args.extend(['-faltivec'])
                  args.extend([
                      '-I/System/Library/Frameworks/vecLib.framework/Headers'])
                  link_args.extend(['-Wl,-framework', '-Wl,vecLib'])
              if args:
                  self.set_info(extra_compile_args=args,
                                extra_link_args=link_args,
                                define_macros=[('NO_ATLAS_INFO', 3),
                                               ('HAVE_CBLAS', None)])
                  return
  
          need_blas = 0
          info = {}
          if atlas_info:
              info = atlas_info
          else:
              warnings.warn(AtlasNotFoundError.__doc__)
              need_blas = 1
              dict_append(info, define_macros=[('NO_ATLAS_INFO', 1)])
  
          if need_blas:
              blas_info = get_info('blas')
              if blas_info:
                  dict_append(info, **blas_info)
              else:
                  warnings.warn(BlasNotFoundError.__doc__)
                  blas_src_info = get_info('blas_src')
                  if not blas_src_info:
                      warnings.warn(BlasSrcNotFoundError.__doc__)
                      return
                  dict_append(info, libraries=[('fblas_src', blas_src_info)])
  
          self.set_info(**info)
          return
  
  
  class blas_info(system_info):
      section = 'blas'
      dir_env_var = 'BLAS'
      _lib_names = ['blas']
      notfounderror = BlasNotFoundError
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
          blas_libs = self.get_libs('blas_libs', self._lib_names)
          info = self.check_libs(lib_dirs, blas_libs, [])
          if info is None:
              return
          if platform.system() == 'Windows':
              # The check for windows is needed because has_cblas uses the
              # same compiler that was used to compile Python and msvc is
              # often not installed when mingw is being used. This rough
              # treatment is not desirable, but windows is tricky.
              info['language'] = 'f77'  # XXX: is it generally true?
          else:
              lib = self.has_cblas(info)
              if lib is not None:
                  info['language'] = 'c'
                  info['libraries'] = [lib]
                  info['define_macros'] = [('HAVE_CBLAS', None)]
          self.set_info(**info)
  
      def has_cblas(self, info):
          # primitive cblas check by looking for the header and trying to link
          # cblas or blas
          res = False
          c = distutils.ccompiler.new_compiler()
          c.customize('')
          tmpdir = tempfile.mkdtemp()
          s = """#include <cblas.h>
          int main(int argc, const char *argv[])
          {
              double a[4] = {1,2,3,4};
              double b[4] = {5,6,7,8};
              return cblas_ddot(4, a, 1, b, 1) > 10;
          }"""
          src = os.path.join(tmpdir, 'source.c')
          try:
              with open(src, 'wt') as f:
                  f.write(s)
  
              try:
                  # check we can compile (find headers)
                  obj = c.compile([src], output_dir=tmpdir,
                                  include_dirs=self.get_include_dirs())
  
                  # check we can link (find library)
                  # some systems have separate cblas and blas libs. First
                  # check for cblas lib, and if not present check for blas lib.
                  try:
                      c.link_executable(obj, os.path.join(tmpdir, "a.out"),
                                        libraries=["cblas"],
                                        library_dirs=info['library_dirs'],
                                        extra_postargs=info.get('extra_link_args', []))
                      res = "cblas"
                  except distutils.ccompiler.LinkError:
                      c.link_executable(obj, os.path.join(tmpdir, "a.out"),
                                        libraries=["blas"],
                                        library_dirs=info['library_dirs'],
                                        extra_postargs=info.get('extra_link_args', []))
                      res = "blas"
              except distutils.ccompiler.CompileError:
                  res = None
          finally:
              shutil.rmtree(tmpdir)
          return res
  
  
  class openblas_info(blas_info):
      section = 'openblas'
      dir_env_var = 'OPENBLAS'
      _lib_names = ['openblas']
      notfounderror = BlasNotFoundError
  
      def check_embedded_lapack(self, info):
          return True
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
  
          openblas_libs = self.get_libs('libraries', self._lib_names)
          if openblas_libs == self._lib_names: # backward compat with 1.8.0
              openblas_libs = self.get_libs('openblas_libs', self._lib_names)
          info = self.check_libs(lib_dirs, openblas_libs, [])
          if info is None:
              return
  
          # Add extra info for OpenBLAS
          extra_info = self.calc_extra_info()
          dict_append(info, **extra_info)
  
          if not self.check_embedded_lapack(info):
              return
  
          info['language'] = 'c'
          info['define_macros'] = [('HAVE_CBLAS', None)]
          self.set_info(**info)
  
  
  class openblas_lapack_info(openblas_info):
      section = 'openblas'
      dir_env_var = 'OPENBLAS'
      _lib_names = ['openblas']
      notfounderror = BlasNotFoundError
  
      def check_embedded_lapack(self, info):
          res = False
          c = distutils.ccompiler.new_compiler()
          c.customize('')
          tmpdir = tempfile.mkdtemp()
          s = """void zungqr();
          int main(int argc, const char *argv[])
          {
              zungqr_();
              return 0;
          }"""
          src = os.path.join(tmpdir, 'source.c')
          out = os.path.join(tmpdir, 'a.out')
          # Add the additional "extra" arguments
          try:
              extra_args = info['extra_link_args']
          except:
              extra_args = []
          try:
              with open(src, 'wt') as f:
                  f.write(s)
              obj = c.compile([src], output_dir=tmpdir)
              try:
                  c.link_executable(obj, out, libraries=info['libraries'],
                                    library_dirs=info['library_dirs'],
                                    extra_postargs=extra_args)
                  res = True
              except distutils.ccompiler.LinkError:
                  res = False
          finally:
              shutil.rmtree(tmpdir)
          return res
  
  
  class blis_info(blas_info):
      section = 'blis'
      dir_env_var = 'BLIS'
      _lib_names = ['blis']
      notfounderror = BlasNotFoundError
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
          blis_libs = self.get_libs('libraries', self._lib_names)
          if blis_libs == self._lib_names:
              blis_libs = self.get_libs('blis_libs', self._lib_names)
  
          info = self.check_libs2(lib_dirs, blis_libs, [])
          if info is None:
              return
  
          # Add include dirs
          incl_dirs = self.get_include_dirs()
          dict_append(info,
                      language='c',
                      define_macros=[('HAVE_CBLAS', None)],
                      include_dirs=incl_dirs)
          self.set_info(**info)
  
  
  class blas_src_info(system_info):
      section = 'blas_src'
      dir_env_var = 'BLAS_SRC'
      notfounderror = BlasSrcNotFoundError
  
      def get_paths(self, section, key):
          pre_dirs = system_info.get_paths(self, section, key)
          dirs = []
          for d in pre_dirs:
              dirs.extend([d] + self.combine_paths(d, ['blas']))
          return [d for d in dirs if os.path.isdir(d)]
  
      def calc_info(self):
          src_dirs = self.get_src_dirs()
          src_dir = ''
          for d in src_dirs:
              if os.path.isfile(os.path.join(d, 'daxpy.f')):
                  src_dir = d
                  break
          if not src_dir:
              #XXX: Get sources from netlib. May be ask first.
              return
          blas1 = '''
          caxpy csscal dnrm2 dzasum saxpy srotg zdotc ccopy cswap drot
          dznrm2 scasum srotm zdotu cdotc dasum drotg icamax scnrm2
          srotmg zdrot cdotu daxpy drotm idamax scopy sscal zdscal crotg
          dcabs1 drotmg isamax sdot sswap zrotg cscal dcopy dscal izamax
          snrm2 zaxpy zscal csrot ddot dswap sasum srot zcopy zswap
          scabs1
          '''
          blas2 = '''
          cgbmv chpmv ctrsv dsymv dtrsv sspr2 strmv zhemv ztpmv cgemv
          chpr dgbmv dsyr lsame ssymv strsv zher ztpsv cgerc chpr2 dgemv
          dsyr2 sgbmv ssyr xerbla zher2 ztrmv cgeru ctbmv dger dtbmv
          sgemv ssyr2 zgbmv zhpmv ztrsv chbmv ctbsv dsbmv dtbsv sger
          stbmv zgemv zhpr chemv ctpmv dspmv dtpmv ssbmv stbsv zgerc
          zhpr2 cher ctpsv dspr dtpsv sspmv stpmv zgeru ztbmv cher2
          ctrmv dspr2 dtrmv sspr stpsv zhbmv ztbsv
          '''
          blas3 = '''
          cgemm csymm ctrsm dsyrk sgemm strmm zhemm zsyr2k chemm csyr2k
          dgemm dtrmm ssymm strsm zher2k zsyrk cher2k csyrk dsymm dtrsm
          ssyr2k zherk ztrmm cherk ctrmm dsyr2k ssyrk zgemm zsymm ztrsm
          '''
          sources = [os.path.join(src_dir, f + '.f') \
                     for f in (blas1 + blas2 + blas3).split()]
          #XXX: should we check here actual existence of source files?
          sources = [f for f in sources if os.path.isfile(f)]
          info = {'sources': sources, 'language': 'f77'}
          self.set_info(**info)
  
  
  class x11_info(system_info):
      section = 'x11'
      notfounderror = X11NotFoundError
  
      def __init__(self):
          system_info.__init__(self,
                               default_lib_dirs=default_x11_lib_dirs,
                               default_include_dirs=default_x11_include_dirs)
  
      def calc_info(self):
          if sys.platform  in ['win32']:
              return
          lib_dirs = self.get_lib_dirs()
          include_dirs = self.get_include_dirs()
          x11_libs = self.get_libs('x11_libs', ['X11'])
          info = self.check_libs(lib_dirs, x11_libs, [])
          if info is None:
              return
          inc_dir = None
          for d in include_dirs:
              if self.combine_paths(d, 'X11/X.h'):
                  inc_dir = d
                  break
          if inc_dir is not None:
              dict_append(info, include_dirs=[inc_dir])
          self.set_info(**info)
  
  
  class _numpy_info(system_info):
      section = 'Numeric'
      modulename = 'Numeric'
      notfounderror = NumericNotFoundError
  
      def __init__(self):
          include_dirs = []
          try:
              module = __import__(self.modulename)
              prefix = []
              for name in module.__file__.split(os.sep):
                  if name == 'lib':
                      break
                  prefix.append(name)
  
              # Ask numpy for its own include path before attempting
              # anything else
              try:
                  include_dirs.append(getattr(module, 'get_include')())
              except AttributeError:
                  pass
  
              include_dirs.append(distutils.sysconfig.get_python_inc(
                                          prefix=os.sep.join(prefix)))
          except ImportError:
              pass
          py_incl_dir = distutils.sysconfig.get_python_inc()
          include_dirs.append(py_incl_dir)
          py_pincl_dir = distutils.sysconfig.get_python_inc(plat_specific=True)
          if py_pincl_dir not in include_dirs:
              include_dirs.append(py_pincl_dir)
          for d in default_include_dirs:
              d = os.path.join(d, os.path.basename(py_incl_dir))
              if d not in include_dirs:
                  include_dirs.append(d)
          system_info.__init__(self,
                               default_lib_dirs=[],
                               default_include_dirs=include_dirs)
  
      def calc_info(self):
          try:
              module = __import__(self.modulename)
          except ImportError:
              return
          info = {}
          macros = []
          for v in ['__version__', 'version']:
              vrs = getattr(module, v, None)
              if vrs is None:
                  continue
              macros = [(self.modulename.upper() + '_VERSION',
                        '"\\"%s\\""' % (vrs)),
                        (self.modulename.upper(), None)]
              break
          dict_append(info, define_macros=macros)
          include_dirs = self.get_include_dirs()
          inc_dir = None
          for d in include_dirs:
              if self.combine_paths(d,
                                    os.path.join(self.modulename,
                                                 'arrayobject.h')):
                  inc_dir = d
                  break
          if inc_dir is not None:
              dict_append(info, include_dirs=[inc_dir])
          if info:
              self.set_info(**info)
          return
  
  
  class numarray_info(_numpy_info):
      section = 'numarray'
      modulename = 'numarray'
  
  
  class Numeric_info(_numpy_info):
      section = 'Numeric'
      modulename = 'Numeric'
  
  
  class numpy_info(_numpy_info):
      section = 'numpy'
      modulename = 'numpy'
  
  
  class numerix_info(system_info):
      section = 'numerix'
  
      def calc_info(self):
          which = None, None
          if os.getenv("NUMERIX"):
              which = os.getenv("NUMERIX"), "environment var"
          # If all the above fail, default to numpy.
          if which[0] is None:
              which = "numpy", "defaulted"
              try:
                  import numpy
                  which = "numpy", "defaulted"
              except ImportError:
                  msg1 = str(get_exception())
                  try:
                      import Numeric
                      which = "numeric", "defaulted"
                  except ImportError:
                      msg2 = str(get_exception())
                      try:
                          import numarray
                          which = "numarray", "defaulted"
                      except ImportError:
                          msg3 = str(get_exception())
                          log.info(msg1)
                          log.info(msg2)
                          log.info(msg3)
          which = which[0].strip().lower(), which[1]
          if which[0] not in ["numeric", "numarray", "numpy"]:
              raise ValueError("numerix selector must be either 'Numeric' "
                               "or 'numarray' or 'numpy' but the value obtained"
                               " from the %s was '%s'." % (which[1], which[0]))
          os.environ['NUMERIX'] = which[0]
          self.set_info(**get_info(which[0]))
  
  
  class f2py_info(system_info):
      def calc_info(self):
          try:
              import numpy.f2py as f2py
          except ImportError:
              return
          f2py_dir = os.path.join(os.path.dirname(f2py.__file__), 'src')
          self.set_info(sources=[os.path.join(f2py_dir, 'fortranobject.c')],
                        include_dirs=[f2py_dir])
          return
  
  
  class boost_python_info(system_info):
      section = 'boost_python'
      dir_env_var = 'BOOST'
  
      def get_paths(self, section, key):
          pre_dirs = system_info.get_paths(self, section, key)
          dirs = []
          for d in pre_dirs:
              dirs.extend([d] + self.combine_paths(d, ['boost*']))
          return [d for d in dirs if os.path.isdir(d)]
  
      def calc_info(self):
          src_dirs = self.get_src_dirs()
          src_dir = ''
          for d in src_dirs:
              if os.path.isfile(os.path.join(d, 'libs', 'python', 'src',
                                             'module.cpp')):
                  src_dir = d
                  break
          if not src_dir:
              return
          py_incl_dirs = [distutils.sysconfig.get_python_inc()]
          py_pincl_dir = distutils.sysconfig.get_python_inc(plat_specific=True)
          if py_pincl_dir not in py_incl_dirs:
              py_incl_dirs.append(py_pincl_dir)
          srcs_dir = os.path.join(src_dir, 'libs', 'python', 'src')
          bpl_srcs = glob(os.path.join(srcs_dir, '*.cpp'))
          bpl_srcs += glob(os.path.join(srcs_dir, '*', '*.cpp'))
          info = {'libraries': [('boost_python_src',
                                 {'include_dirs': [src_dir] + py_incl_dirs,
                                  'sources':bpl_srcs}
                                )],
                  'include_dirs': [src_dir],
                  }
          if info:
              self.set_info(**info)
          return
  
  
  class agg2_info(system_info):
      section = 'agg2'
      dir_env_var = 'AGG2'
  
      def get_paths(self, section, key):
          pre_dirs = system_info.get_paths(self, section, key)
          dirs = []
          for d in pre_dirs:
              dirs.extend([d] + self.combine_paths(d, ['agg2*']))
          return [d for d in dirs if os.path.isdir(d)]
  
      def calc_info(self):
          src_dirs = self.get_src_dirs()
          src_dir = ''
          for d in src_dirs:
              if os.path.isfile(os.path.join(d, 'src', 'agg_affine_matrix.cpp')):
                  src_dir = d
                  break
          if not src_dir:
              return
          if sys.platform == 'win32':
              agg2_srcs = glob(os.path.join(src_dir, 'src', 'platform',
                                            'win32', 'agg_win32_bmp.cpp'))
          else:
              agg2_srcs = glob(os.path.join(src_dir, 'src', '*.cpp'))
              agg2_srcs += [os.path.join(src_dir, 'src', 'platform',
                                         'X11',
                                         'agg_platform_support.cpp')]
  
          info = {'libraries':
                  [('agg2_src',
                    {'sources': agg2_srcs,
                     'include_dirs': [os.path.join(src_dir, 'include')],
                    }
                   )],
                  'include_dirs': [os.path.join(src_dir, 'include')],
                  }
          if info:
              self.set_info(**info)
          return
  
  
  class _pkg_config_info(system_info):
      section = None
      config_env_var = 'PKG_CONFIG'
      default_config_exe = 'pkg-config'
      append_config_exe = ''
      version_macro_name = None
      release_macro_name = None
      version_flag = '--modversion'
      cflags_flag = '--cflags'
  
      def get_config_exe(self):
          if self.config_env_var in os.environ:
              return os.environ[self.config_env_var]
          return self.default_config_exe
  
      def get_config_output(self, config_exe, option):
          cmd = config_exe + ' ' + self.append_config_exe + ' ' + option
          s, o = exec_command(cmd, use_tee=0)
          if not s:
              return o
  
      def calc_info(self):
          config_exe = find_executable(self.get_config_exe())
          if not config_exe:
              log.warn('File not found: %s. Cannot determine %s info.' \
                    % (config_exe, self.section))
              return
          info = {}
          macros = []
          libraries = []
          library_dirs = []
          include_dirs = []
          extra_link_args = []
          extra_compile_args = []
          version = self.get_config_output(config_exe, self.version_flag)
          if version:
              macros.append((self.__class__.__name__.split('.')[-1].upper(),
                             '"\\"%s\\""' % (version)))
              if self.version_macro_name:
                  macros.append((self.version_macro_name + '_%s'
                                 % (version.replace('.', '_')), None))
          if self.release_macro_name:
              release = self.get_config_output(config_exe, '--release')
              if release:
                  macros.append((self.release_macro_name + '_%s'
                                 % (release.replace('.', '_')), None))
          opts = self.get_config_output(config_exe, '--libs')
          if opts:
              for opt in opts.split():
                  if opt[:2] == '-l':
                      libraries.append(opt[2:])
                  elif opt[:2] == '-L':
                      library_dirs.append(opt[2:])
                  else:
                      extra_link_args.append(opt)
          opts = self.get_config_output(config_exe, self.cflags_flag)
          if opts:
              for opt in opts.split():
                  if opt[:2] == '-I':
                      include_dirs.append(opt[2:])
                  elif opt[:2] == '-D':
                      if '=' in opt:
                          n, v = opt[2:].split('=')
                          macros.append((n, v))
                      else:
                          macros.append((opt[2:], None))
                  else:
                      extra_compile_args.append(opt)
          if macros:
              dict_append(info, define_macros=macros)
          if libraries:
              dict_append(info, libraries=libraries)
          if library_dirs:
              dict_append(info, library_dirs=library_dirs)
          if include_dirs:
              dict_append(info, include_dirs=include_dirs)
          if extra_link_args:
              dict_append(info, extra_link_args=extra_link_args)
          if extra_compile_args:
              dict_append(info, extra_compile_args=extra_compile_args)
          if info:
              self.set_info(**info)
          return
  
  
  class wx_info(_pkg_config_info):
      section = 'wx'
      config_env_var = 'WX_CONFIG'
      default_config_exe = 'wx-config'
      append_config_exe = ''
      version_macro_name = 'WX_VERSION'
      release_macro_name = 'WX_RELEASE'
      version_flag = '--version'
      cflags_flag = '--cxxflags'
  
  
  class gdk_pixbuf_xlib_2_info(_pkg_config_info):
      section = 'gdk_pixbuf_xlib_2'
      append_config_exe = 'gdk-pixbuf-xlib-2.0'
      version_macro_name = 'GDK_PIXBUF_XLIB_VERSION'
  
  
  class gdk_pixbuf_2_info(_pkg_config_info):
      section = 'gdk_pixbuf_2'
      append_config_exe = 'gdk-pixbuf-2.0'
      version_macro_name = 'GDK_PIXBUF_VERSION'
  
  
  class gdk_x11_2_info(_pkg_config_info):
      section = 'gdk_x11_2'
      append_config_exe = 'gdk-x11-2.0'
      version_macro_name = 'GDK_X11_VERSION'
  
  
  class gdk_2_info(_pkg_config_info):
      section = 'gdk_2'
      append_config_exe = 'gdk-2.0'
      version_macro_name = 'GDK_VERSION'
  
  
  class gdk_info(_pkg_config_info):
      section = 'gdk'
      append_config_exe = 'gdk'
      version_macro_name = 'GDK_VERSION'
  
  
  class gtkp_x11_2_info(_pkg_config_info):
      section = 'gtkp_x11_2'
      append_config_exe = 'gtk+-x11-2.0'
      version_macro_name = 'GTK_X11_VERSION'
  
  
  class gtkp_2_info(_pkg_config_info):
      section = 'gtkp_2'
      append_config_exe = 'gtk+-2.0'
      version_macro_name = 'GTK_VERSION'
  
  
  class xft_info(_pkg_config_info):
      section = 'xft'
      append_config_exe = 'xft'
      version_macro_name = 'XFT_VERSION'
  
  
  class freetype2_info(_pkg_config_info):
      section = 'freetype2'
      append_config_exe = 'freetype2'
      version_macro_name = 'FREETYPE2_VERSION'
  
  
  class amd_info(system_info):
      section = 'amd'
      dir_env_var = 'AMD'
      _lib_names = ['amd']
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
  
          amd_libs = self.get_libs('amd_libs', self._lib_names)
          info = self.check_libs(lib_dirs, amd_libs, [])
          if info is None:
              return
  
          include_dirs = self.get_include_dirs()
  
          inc_dir = None
          for d in include_dirs:
              p = self.combine_paths(d, 'amd.h')
              if p:
                  inc_dir = os.path.dirname(p[0])
                  break
          if inc_dir is not None:
              dict_append(info, include_dirs=[inc_dir],
                          define_macros=[('SCIPY_AMD_H', None)],
                          swig_opts=['-I' + inc_dir])
  
          self.set_info(**info)
          return
  
  
  class umfpack_info(system_info):
      section = 'umfpack'
      dir_env_var = 'UMFPACK'
      notfounderror = UmfpackNotFoundError
      _lib_names = ['umfpack']
  
      def calc_info(self):
          lib_dirs = self.get_lib_dirs()
  
          umfpack_libs = self.get_libs('umfpack_libs', self._lib_names)
          info = self.check_libs(lib_dirs, umfpack_libs, [])
          if info is None:
              return
  
          include_dirs = self.get_include_dirs()
  
          inc_dir = None
          for d in include_dirs:
              p = self.combine_paths(d, ['', 'umfpack'], 'umfpack.h')
              if p:
                  inc_dir = os.path.dirname(p[0])
                  break
          if inc_dir is not None:
              dict_append(info, include_dirs=[inc_dir],
                          define_macros=[('SCIPY_UMFPACK_H', None)],
                          swig_opts=['-I' + inc_dir])
  
          amd = get_info('amd')
          dict_append(info, **get_info('amd'))
  
          self.set_info(**info)
          return
  
  
  def combine_paths(*args, **kws):
      """ Return a list of existing paths composed by all combinations of
          items from arguments.
      """
      r = []
      for a in args:
          if not a:
              continue
          if is_string(a):
              a = [a]
          r.append(a)
      args = r
      if not args:
          return []
      if len(args) == 1:
          result = reduce(lambda a, b: a + b, map(glob, args[0]), [])
      elif len(args) == 2:
          result = []
          for a0 in args[0]:
              for a1 in args[1]:
                  result.extend(glob(os.path.join(a0, a1)))
      else:
          result = combine_paths(*(combine_paths(args[0], args[1]) + args[2:]))
      verbosity = kws.get('verbosity', 1)
      log.debug('(paths: %s)', ','.join(result))
      return result
  
  language_map = {'c': 0, 'c++': 1, 'f77': 2, 'f90': 3}
  inv_language_map = {0: 'c', 1: 'c++', 2: 'f77', 3: 'f90'}
  
  
  def dict_append(d, **kws):
      languages = []
      for k, v in kws.items():
          if k == 'language':
              languages.append(v)
              continue
          if k in d:
              if k in ['library_dirs', 'include_dirs',
                       'extra_compile_args', 'extra_link_args',
                       'runtime_library_dirs', 'define_macros']:
                  [d[k].append(vv) for vv in v if vv not in d[k]]
              else:
                  d[k].extend(v)
          else:
              d[k] = v
      if languages:
          l = inv_language_map[max([language_map.get(l, 0) for l in languages])]
          d['language'] = l
      return
  
  
  def parseCmdLine(argv=(None,)):
      import optparse
      parser = optparse.OptionParser("usage: %prog [-v] [info objs]")
      parser.add_option('-v', '--verbose', action='store_true', dest='verbose',
                        default=False,
                        help='be verbose and print more messages')
  
      opts, args = parser.parse_args(args=argv[1:])
      return opts, args
  
  
  def show_all(argv=None):
      import inspect
      if argv is None:
          argv = sys.argv
      opts, args = parseCmdLine(argv)
      if opts.verbose:
          log.set_threshold(log.DEBUG)
      else:
          log.set_threshold(log.INFO)
      show_only = []
      for n in args:
          if n[-5:] != '_info':
              n = n + '_info'
          show_only.append(n)
      show_all = not show_only
      _gdict_ = globals().copy()
      for name, c in _gdict_.items():
          if not inspect.isclass(c):
              continue
          if not issubclass(c, system_info) or c is system_info:
              continue
          if not show_all:
              if name not in show_only:
                  continue
              del show_only[show_only.index(name)]
          conf = c()
          conf.verbosity = 2
          r = conf.get_info()
      if show_only:
          log.info('Info classes not defined: %s', ','.join(show_only))
  
  if __name__ == "__main__":
      show_all()
  
apis: numpy.distutils.compat.get_exception numpy.distutils.exec_command.exec_command numpy.distutils.misc_util.is_sequence numpy.distutils.misc_util.is_string numpy.distutils.misc_util.get_shared_lib_extension