This are the supplementary kernel drivers for the VirtualBox virtualization environment to be used within a guest. To build the package for a kernel different from the running one, start the script setting the KERNEL variable as in KERNEL=2.6.38.8 ./virtualbox-kernel.SlackBuild If you want to build a kernel module for an other virtualbox version you can use the included "virtualbox-kernel-addons-mksrctarball.sh" which will generate the needed source package for you. You will need to have the coresponding virtualbox-ose-addons version already installed. This package is intended to be used on GUEST / VIRTUAL MACHINES running Slackware, NOT the host system.