code: def add_libav_on_win(ext):
      """no pkg-config on windows, simply assume these libs are available"""
      ext.libraries += ["avformat", "avutil", "avcodec", "swresample"]
      for define_macro in ["HAVE_LIBAV", "HAVE_SWRESAMPLE"]:
          ext.define_macros += [(define_macro, 1)]
  
imports: import sys, os, glob, subprocess
  import distutils, distutils.command.clean, distutils.dir_util
  from gen_external import generate_external, header, output_path
  from this_version import get_aubio_version
  from distutils.command.build_ext import build_ext
label_desc: Use image node_id 8 for calling a global function with example usage: add_libav_on_win(ext) without return types