https://github.com/MoscowskyAnton/tobii_eye_tracker_linux_installer repackaged for Nix/NixOS.

nix build will create result/bin with useful binaries.

https://github.com/t184256/gaze-streamer is an example of using this Nix flake from another flake.

Please refer to https://github.com/MoscowskyAnton/tobii_eye_tracker_linux_installer and https://github.com/Eitol/tobii_eye_tracker_linux_installer for more info and non-NixOS instructions.