Sorry for the delayed reply. You are right in that we often tell people that VL6.0 is based on Slackware 12.1 and that is the best guide to use when searching for non-vl packages. However, if a package works, then it works. And since it is so easy to remove a package with 'removepkg', they are often worth a try. Keep in mind your chances decrease the more the version numbers diverge.