OK

[Justin Ekis]

I wrote.
> You simply need to download this package using wget like this.
> wget
>
ftp://distro.ibiblio.org/pub/linux/distributions/slackware/slackware-9.0/slackware/k/kernel-source-2.4.20-noarch5.tgz
> then type installpkg kernel-source-2.4.20-noarch5.tgz and try again.

Oops, looking again at your error, I'm not sure my answer is correct.
Doing that helped me with a similar error message, but I'm not sure it's
the same. Worth trying though.
I don't know if you need root privilages to access that file, if all
else fails try as root if you're not already.

Justin