def optional_install():
    """Generates configuration settings for optional functionality of ISAMBARD."""
    # reduce
    print('{BOLD}Setting up Reduce (optional){END_C}'.format(**text_colours))
    reduce = {}
    reduce_path = get_user_path('Please provide a path to your reduce executable.', required=False)
    reduce['path'] = str(reduce_path)
    reduce['folder'] = str(reduce_path.parent) if reduce_path else ''
    settings['reduce'] = reduce

    # naccess
    print('{BOLD}Setting up naccess (optional){END_C}'.format(**text_colours))
    naccess = {}
    naccess_path = get_user_path('Please provide a path to your naccess executable.', required=False)
    naccess['path'] = str(naccess_path)
    settings['naccess'] = naccess

    # profit
    print('{BOLD}Setting up ProFit (optional){END_C}'.format(**text_colours))
    profit = {}
    profit_path = get_user_path('Please provide a path to your ProFit executable.', required=False)
    profit['path'] = str(profit_path)
    settings['profit'] = profit
    return
Generates configuration settings for optional functionality of ISAMBARD.