I have the same issue on Platform x86.

Usage: /usr/share/0trace/0trace.sh iface target_ip [ target_port ]
root@kali:~# /usr/share/0trace/0trace.sh eth1 192.168.1.2
[-] /bin/usleep not found on this system, sorry.

as written on http://www.aldeid.com/wiki/0trace :

<quote>

create a file usleep.c (e.g. in /tmp/) with following lines:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main (int argc, char **argv) {
usleep(atoi(argv[1]));
return 0;
}

Compile it in /bin:

$ sudo gcc -o /bin/usleep usleep.c

</quote>

it worked fine for me, or, as i once read on backtrack forum, one can edit /usr/share/0trace/0trace.sh script to use sleep 100 instead of usleep 100000

fixed in 0trace_0.01-3