* ```
$ nix-env -I nixpkgs=~/work/nixpkgs --install nixpkgs.katagoWithCuda
error: selector 'nixpkgs.katagoWithCuda' matches no derivations
$ nix-env -I nixpkgs-overlays=/var/empty/ -I nixpkgs=~/work/nixpkgs --install nixpkgs.katagoWithCuda
error: selector 'nixpkgs.katagoWithCuda' matches no derivations
``` :(