From http://www.jwz.org/xscreensaver/xscreensaver-5.40.tar.gz
[xscreensaver] / hacks / halftone.c
2016-10-24 Zygo BlaxellFrom jwz.org/xscreensaver/xscreensaver-5.35.tar.gz
2013-07-16 Zygo BlaxellFrom jwz.org/xscreensaver/xscreensaver-5.22.tar.gz
2013-02-08 Zygo BlaxellFrom jwz.org/xscreensaver/xscreensaver-5.16.tar.gz
2013-02-08 Zygo Blaxellslackware.bholcomb.com/slackware/slackware-11.0/source...
2013-02-08 Zygo Blaxellsvn.poeml.de/viewvc/ppc/src-unpacked/xscreensaver/xscre...
2013-02-08 Zygo Blaxellftp://ftp.krokus.ru/pub/OpenBSD/distfiles/xscreensaver...