From http://www.jwz.org/xscreensaver/xscreensaver-5.40.tar.gz
[xscreensaver] / hacks / glx / cityflow.c
2017-12-22 Zygo BlaxellFrom jwz.org/xscreensaver/xscreensaver-5.38.tar.gz
2017-07-05 Zygo BlaxellFrom jwz.org/xscreensaver/xscreensaver-5.37.tar.gz
2014-12-01 Zygo BlaxellFrom jwz.org/xscreensaver/xscreensaver-5.32.tar.gz
2014-11-16 Zygo BlaxellFrom jwz.org/xscreensaver/xscreensaver-5.31.tar.gz