function build_game(varargin)
    if(nargin == 1 && strcmp(varargin(1), 'backup') ~= 0)
        % build backup software
        make_all_install;
        build_turtle_motion4W('backup');
        build_all('backup');
    else
        % build normal software
        make_all_install;
        build_turtle_motion4W;
        build_all;
    end
end