code: def get_flag(var, fallback, expected=True, warn=True):
      """Use a fallback method for determining SOABI flags if the needed config
      var is unset or unavailable."""
      val = get_config_var(var)
      if val is None:
          if warn:
              log.debug(
                  "Config variable '%s' is unset, Python ABI tag may "
                  "be incorrect",
                  var,
              )
          return fallback()
      return val == expected
  
imports: from __future__ import absolute_import
  import distutils.util
  from distutils import log
  import platform
  import re
  import sys
  import sysconfig
  import warnings
  from collections import OrderedDict
  import glibc
label_desc: Use image node_id 6 for calling a global function with example usage: get_flag(var, fallback, expected, warn) and returns: unknown, fallback