[FW1] Snoop Problem

[m . furmage]

Hi,

I have a Solaris7 box setup as per Lance's "Solaris7 and FW-1 4.1" instructions however I am getting the following error when I try to run snoop:
ld.so.1: snoop: fatal: libxfn.so.2: open failed: No such file or directory
Killed

The only difference I can see is that I don't have SUNWudfr installed. Does anyone know what this package is for? and if it is required to run snoop? If not does anyone know the required packages to run snoop?

Thanks,

Marc