def METHOD_NAME(env, **kw) -> None:
    """ Generate the `msgmerge` tool """
    if sys.platform == 'win32':
        msgmerge = SCons.Tool.find_program_path(
            env, 'msgmerge', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS
        )
        if msgmerge:
            msgmerge_bin_dir = os.path.dirname(msgmerge)
            env.AppendENVPath('PATH', msgmerge_bin_dir)
        else:
            SCons.Warnings.warn(
                # MsgmergeToolWarning,  # using this breaks test, so keep:
                SCons.Warnings.SConsWarning,
                'msgmerge tool requested, but binary not found in ENV PATH',
            )
    try:
        env['MSGMERGE'] = _detect_msgmerge(env)
    except StopError:
        env['MSGMERGE'] = 'msgmerge'
    env.SetDefault(
        POTSUFFIX=['.pot'],
        POSUFFIX=['.po'],
        MSGMERGECOM='$MSGMERGE  $MSGMERGEFLAGS --update $TARGET $SOURCE',
        MSGMERGECOMSTR='',
        MSGMERGEFLAGS=[],
        POUPDATE_ALIAS='po-update',
    )
    env.Append(BUILDERS={'_POUpdateBuilder': _POUpdateBuilder(env)})
    env.AddMethod(_POUpdateBuilderWrapper, 'POUpdate')
    env.AlwaysBuild(env.Alias('$POUPDATE_ALIAS'))