1error:2 … while evaluating a branch condition3 at «string»:25:5:4 24| v:5 25| if !builtins.isAttrs v || isDrv v then6 | ^7 26| v89 … in the left operand of the OR (||) operator10 at «string»:25:28:11 24| v:12 25| if !builtins.isAttrs v || isDrv v then13 | ^14 26| v1516 … while evaluating definitions from `/nix/store/8ggr67sci43hlp8ba6rhjrdhhj5490am-source/modules/system':1718 … while evaluating the option `assertions':1920 … while evaluating definitions from `/nix/store/8ggr67sci43hlp8ba6rhjrdhhj5490am-source/modules/users':2122 … while evaluating the option `users.users':2324 … while evaluating definitions from `/nix/store/8ggr67sci43hlp8ba6rhjrdhhj5490am-source/modules/nix':2526 … while evaluating the option `nix.settings':2728 … while evaluating definitions from `/nix/store/8ggr67sci43hlp8ba6rhjrdhhj5490am-source/modules/nix':2930 … while evaluating the option `nix.package':3132 … while evaluating the module argument `pkgs' in "/nix/store/8ggr67sci43hlp8ba6rhjrdhhj5490am-source/modules/nix":3334 … noting that argument `pkgs` is not externally provided, so querying `_module.args` instead, requiring `config`3536 (stack trace truncated; use '--show-trace' to show the full, detailed trace)3738 error: Nixpkgs 26.11 has dropped support for x86_64-darwin.3940 The 26.05 stable branch still supports x86_64-darwin, and will41 receive security fixes until the end of 2026. If you use channels,42 you can switch to 26.05 as follows:4344 $ sudo nix-channel --add https://nixos.org/channels/nixpkgs-26.05-darwin nixpkgs45 $ sudo nix-channel --update4647 If this doesn’t work, you may need to run:4849 # Lack of sudo is deliberate:50 $ nix-channel --remove nixpkgs5152 If you use flakes, switch your flake input:5354 inputs.nixpkgs = {55 url = "github:NixOS/nixpkgs/nixpkgs-26.05-darwin";56 };5758 See the release notes for more information and alternatives:5960 https://nixos.org/manual/nixpkgs/unstable/release-notes#x86_64-darwin-26.11