Usage:
  compel [--compat] includes | cflags | ldflags
  compel plugins [PLUGIN_NAME ...]
  compel [--compat] [--static] libs
  compel -f FILE -o FILE [-p NAME] [-l N] hgen
    -f, --file FILE		input (parasite object) file name
    -o, --output FILE		output (header) file name
    -p, --prefix NAME		prefix for var names
    -l, --log-level NUM		log level (default: 2)
  compel -h|--help
  compel -V|--version