c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
         { allowUnsupportedSystem = true; }
       to ~/.config/nixpkgs/config.nix.

Cannot nix-instantiate `gnome-control-center.passthru.tests` because:
warning: experimental feature 'no-url-literals' has been stabilized and renamed; use 'lint-url-literals = fatal' setting instead
evaluation warning: Nixpkgs 26.05 will be the last release to support x86_64-darwin; see https://nixos.org/manual/nixpkgs/unstable/release-notes#x86_64-darwin-26.05
error: attribute 'tests' in selection path 'gnome-control-center.passthru.tests' not found