You'll need x11/linux-nvidia-libs, devel/libepoll-shim, emulators/libc6-shim and maybe science/linux-ai-ml-env to use CUDA on Linuxulator.
With all the above installed (-devel variants of NVIDIA things, though),
% nv-sglrun nvidia-smi
/usr/local/lib/libc6-shim/libc6.so: shim init
Fri Mar 13...