nmap is missing /dev/bpf4

[Gergo Szakal <bastyaelvtars@xxxxxxxxx>]

[fw] ~# nmap -P0 xxx.xxx.xxx.xxx

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2006-12-04 19:54 CET
pcap_open_live(sk0, 100, 0, 2) FAILED. Reported error: (no devices 
found) /dev/bpf4: No such file or directory.  Will wait 5 seconds then 
retry.

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Is this an error of the pkgsrc package or an OS shortage? (There are 
only bpf 0-3).