0trace v0.01 by firstname.lastname@example.org is in the Network Mappings -> Identify Live Hosts category.
It requires /bin/usleep to run which is not installed in the BT4 vmware image.
Change the source so it uses sleep instead of usleep.
Change lines 12 and 13 from /bin/usleep to /bin/sleep
Change lines 45 and 53 from usleep 100000 to sleep 100s