<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def warn_on_deprecated_args(self, args):
 """ Print warning messages for any deprecated arguments that were passed. """


        # Output warning if setup.py is present and neither --ignore-setup-py
        # nor --use-setup-py was specified.
        if getattr(args, "private", None) is not None and \
                (os.path.exists(os.path.join(args.private, "setup.py")) or
                 os.path.exists(os.path.join(args.private, "pyproject.toml"))
                ):
            if not getattr(args, "use_setup_py", False) and \
                    not getattr(args, "ignore_setup_py", False):
                warning("  **** FUTURE BEHAVIOR CHANGE WARNING ****")
                warning("Your project appears to contain a setup.py file.")
                warning("Currently, these are ignored by default.")
                warning("This will CHANGE in an upcoming version!")
                warning("")
                warning("To ensure your setup.py is ignored, please specify:")
                warning("    --ignore-setup-py")
                warning("")
                warning("To enable what will some day be the default, specify:")
                warning("    --use-setup-py")

        # NDK version is now determined automatically
        if args.ndk_version is not None:
            warning('--ndk-version is deprecated and no longer necessary, '
                    'the value you passed is ignored')
        if 'ANDROIDNDKVER' in environ:
            warning('$ANDROIDNDKVER is deprecated and no longer necessary, '
                    'the value you set is ignored')