I have some 2.5.x kernel sources that I want to use when installing gentoo, I already have them downloaded (I am on a very narrowband connection) so I wan't to avoid downloading the sources in the ...

Not that I'm an expert by any means, but when I was installing gentoo, gentoo-sources failed. I've seen others in the gentoo forums complain of the same. Rather than try and fix it, I just went with ...