Your CPU is too old, you need to build from source.
What magic is it that you are using that prevents old CPUs from working? My old offline AMD C60 (64-bit) does not work either.
Building from source on an old machine like that is not really viable, it will take days.
There must be an option to ./configure to disable your magic so that we can build on a more modern machine.
Any ideas?
It was viable but took a few hours. I think it's time to either get a new offline laptop or get one of those easier to use HW wallets.