nixos support

[habere-et-dispertire]

Any hope of a nix expression to run this ?
I don't have the heart to add it to the +5K requests in the pool.

$ ./classfi 
Could not start dynamically linked executable: ./classfi
NixOS cannot run dynamically linked executables intended for generic
linux environments out of the box. For more information, see:
https://nix.dev/permalink/stub-ld

No pressure like.
🍓

[carmiac]

I'm a bit of a greybead who considers anything moving faster than Debian to be just a bit sus, so I don't really have anything to test it on. But I'm happy to accept a PR.