** Building 'vboxdrv' module ***
make: Entering directory `/tmp/SBo/virtualbox-kernel-4.2.0/vboxdrv'
Makefile:190: *** Error: KERN_DIR does not point to a directory. Stop.
make: Leaving directory `/tmp/SBo/virtualbox-kernel-4.2.0/vboxdrv'
make: *** [all] Error 2
Would you like to continue processing the rest of the
queue or would you like to abort? If this failed
package is a dependency of another package in the queue
then it may not make sense to continue.
The kernel is the one that comes installed with Slackware-Current
bash-4.2# uname -r