Once upon a time, Nicolas Kovacs info@microlinux.fr said:
No, there's no configuration setting. And no way to turn it off. Patrick Volkerding wrote about this some time ago in Slackware's ChangeLog.txt, explaining he decided to upgrade this single piece of software mid-release just to get rid of the nagging warning screen.
It's Open Source - patching to remove such a nag is legal and a service to the users.
It's a screensaver program - how many updates does it need anyway? If it is just updates to add more fancy animations, there is zero reason to demand people upgrade.