Hi @danii0206, the above project kindly created by @eitol is designed to access the Tobii Tracker using the Stream Engine API for the purposes of gaze interaction and to develop gaze-enabled eye tracking. The program is not adapted to help with games to access the eye tracking within Linux.
That being said, theHunter call of the wild has full eye tracking support already enabled on Steam Running within Windows
Accordingly, to enable eye tracking for this game, for the time being only the Windows platform is supported. Apologies for any incovenience.