Libnids and DSniff


I installed DSniff and Libnids from but when I went to use DSniff on my computer, it would not work with the interface I specified. This is what it said:

[localhost:~] root# dsniff -i eth0
dsniff: nids_init: eth0: Device not configured

It will only work with the en0 interface and i'm not using that one. When I tried to go and compile Libnids thinking that it might work if I installed it from the source code, but I got errors when I was compiling. Has anyone got either of these to work with X?