code: def _init_posix(vars):
      
      # load the installed Makefile:
      makefile = get_makefile_filename()
      try:
          _parse_makefile(makefile, vars)
      except IOError as e:
          msg = "invalid Python installation: unable to open %s" % makefile
          if hasattr(e, "strerror"):
              msg = msg + " (%s)" % e.strerror
          raise IOError(msg)
      # load the installed pyconfig.h:
      config_h = get_config_h_filename()
      try:
          with open(config_h) as f:
              parse_config_h(f, vars)
      except IOError as e:
          msg = "invalid Python installation: unable to open %s" % config_h
          if hasattr(e, "strerror"):
              msg = msg + " (%s)" % e.strerror
          raise IOError(msg)
      # On AIX, there are wrong paths to the linker scripts in the Makefile
      # -- these paths are relative to the Python source, but when installed
      # the scripts are in another directory.
      if _PYTHON_BUILD:
          vars['LDSHARED'] = vars['BLDSHARED']
docs: Initialize the module as appropriate for POSIX systems.