"Package not available"

[Corey Velan <corey.velan@fixmestick.com>]

Hello, 

I am trying to create a live image that works on very, very old PCs (and new ones).  I'm using linux-image-486 and wheezy-backports.

I get this error when building

The following packages have unmet dependencies:

 linux-headers-486 : Depends: linux-headers-3.10-0.bpo.3-486 but it is not installable

 linux-image-486 : Depends: linux-image-3.10-0.bpo.3-486 but it is not installable

and when I look at http://packages.debian.org/wheezy-backports/linux-image-486,  I see 

dep: linux-image-3.10-0.bpo.3-486

Package not available

What dies package not available mean?  How can I work around this?

Thanks,

Corey