No Optix with RTX 2060 Super under Linux?

I am running GENTOO Linux, Linux kernel 5.5.11.

I built a new PC to replace my 12 year old one.
The new PC runs a NVidia RTX 2060 SUPER.

BUT……with the newest built from as with the latest stable Blender
says under the Tab “Optix” (user prefs), that there is no capable GPU found.
CUDA works ok.

How can I make this work?

Thanks a lot in advance for any help!