There are a whole suite of perl modules you must download and install. 
They are in the README's somewhere about spidering. I ran into the same 
problem. Takes about a half hour to do the whole thing.

On Tue, 22 Jun 1999, Michael Schulz wrote:

> Hello,
> 
> i downloaded the lastest Version of SwishE and compiled it under Linux.
> 
> Now i want to run SwishE as http-methode, so i call swish-e :
> 
>         swish-e -S http -c swish-e.config
> 
> but i´ve got the following message
> 
> Can't locate LWP/UserAgent.pm in @INC (@INC contains:
> /usr/lib/perl5/5.00502/i586-linux /usr/lib/perl5/5.00502
> /usr/lib/perl5/site_perl/5.005/i586-linux /usr/lib/perl5/site_perl/5.005
> .) at /usr/src/swish/src/swishspider line 3.
> BEGIN failed--compilation aborted at /usr/src/swish/src/swishspider line
> 3.
> 
> 
> Any idea?
> 
> Michael
>