Building for an old linux kernel target

Hello,

I'm trying to build a toolchain for an old Arm926 core that's running linux
kernel v2.6.35.3. That kernel isn't in the default list, likely since it's
so far past EOL. In my reading I found
https://crosstool-ng.github.io/docs/internals/ page in the docs, but I
don't quite grok how the kernel.in/kernel.sh files define the different
kernel versions available. Is there a simple path to getting support for
the old kernel setup?

I'm open to running an older version of crosstool-NG that has support, but
I'm not sure how to figure out what the correct version would be?

-Thomas