libtool can't find a library

[Ben Paley]

Hello,

I've googled this, but only manage to come up with the same question, never an 
answer!

I'm running FreeBSD 6.2-PRERELEASE, and trying to compile kftpgrabber (there 
seems to be a bug in the version that's in the ports) and I get this error:

libtool: link: cannot find the library `'

(That's the whole line, it really does end with a back-tick and a single 
quote).

I don't know where to begin with this since google has let me down, so I'd 
really appreciate some help!

Cheers,
Ben