* Could not find a Makefile in the kernel source directory.
 * Please ensure that /usr/src/linux points to a complete set of Linux sources
 * Unable to calculate Linux Kernel version for build, attempting to use running version
 * Unable to check for the following kernel config options due
 * to absence of any configured kernel sources or compiled
 * config:
 *  - PID_NS - PID_NS is required for sandbox to work
 *  - NET_NS - NET_NS is required for sandbox to work
 * You're on your own to make sure they are set if needed.