"sbbuilder" means "SlackBuild builder". So one would run QupZilla.SlackBuild as root to do the fetching and the building.
Sbbuilder does a great job of turning out a properly formatted VL-style SlackBuild. In the case of a browser or such, an actually useful build is usually several edits on down the line yet.
BTW, anyone have a working "surf" on VL?