Hi @hedmo, we can only offer a software development kit for linux under ubuntu which is for software engineers to create their own software, so there is no solution currently available to run your device directly on linux (and gentoo is not supported) in the same manner as windows with the software ready for eye tracking.
Apologies for the disappointing news, if you are however a developer and wish to get the Linux SDK for Ubuntu to create your own applications, please let me know. Best Wishes.