POV-Ray: The Persistence of Vision Raytracer is a high-quality, totally free tool for creating stunning three-dimensional graphics. The author of POV-Ray asks users who build their own binaries to include their name and e-mail in the final result. The included SlackBuild offers this possibility by entering the information on the command line like this: # POVRAY_BUILDER="your name " ./povray.SlackBuild If you leave this variable empty, it will be supplied by the SlackBuild script as "`whoami` on `hostname`"