linux-headers-2.6.26-bpo.1-686 depends on unstable linux-kbuild-2.6.26-1

[Brice Figureau <brice+bpo@daysofwonder.com>]

Hi,

I wanted to build the nvidia module with m-a on a etch-backports kernel,
but stumble upon the following dependency error:

$ wajig install linux-headers-2.6.26-bpo.1-686
...
The following packages have unmet dependencies:
  linux-headers-2.6.26-bpo.1-686: Depends: linux-kbuild-2.6.26 but it is
not going to be installed
E: Broken packages

Trying to force install linux-kbuild-2.6.26 is not possible as it
depends on a version of libc6 which is only in unstable.

Beside compiling my own kernel packages, is there an easy solution I
might not have seen?
-- 
Brice Figureau <brice+bpo@daysofwonder.com>