Kismet with AC66u optware?

[ml70]

How to make this run? What i've done:

#ipkg install kismet

#ls -l /tmp/mnt/disk1/asusware/bin/kismet*
-rwxr-xr-x 1 admin root 1700 Feb 18 2012 kismet*
-rwxr-xr-x 1 admin root 548460 Feb 18 2012 kismet_client*
-rwxr-xr-x 1 admin root 323932 Feb 18 2012 kismet_drone*
-rwxr-xr-x 1 admin root 801324 Feb 18 2012 kismet_server*

#kismet --help
/opt/bin/kismet [server options] -- [client options]
ex: /opt/bin/kismet -c pcap,eth0,cisco,Kismet -p 5000 -- -q -p 5000
to start the server with a pcap capture source on port 5000 and start the
client in quiet mode on the same port.

Seems eth1 is the 2.4GHz device, so:

# kismet -c pcap,eth1,cisco,Kismet -p 5000 -- -q -p 5000
Server options: -c pcap,eth1,cisco,Kismet -p 5000
Client options: -q -p 5000
Starting server...
Waiting for server to start before starting UI...
Suid priv-dropping disabled. This may not be secure.
No specific sources given to be enabled, all will be enabled.
Enabling channel hopping.
Enabling channel splitting.
FATAL: Unknown capture source type 'pcap' in source 'pcap,eth1,cisco,Kismet'

Tried a few variations, can't get it to run.

# ipkg status libpcap
Package: libpcap
Version: 1.3.0-1
Status: install ok installed
Architecture: mipsel

What now? If it isn't obvious yet, never used kismet before...