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/lrxvs4l9bqbgjfz7w9bkfg5zqq442jxc-source/modules/transposition.nix':1718 … while evaluating definitions from `/nix/store/2y1ay9y2g2pinc6g2r4fxyy4y6gkbqyn-source/flake.nix, via option perSystem':1920 … while evaluating the module argument `pkgs' in ":anon-12:anon-1":2122 … noting that argument `pkgs` is not externally provided, so querying `_module.args` instead, requiring `config`2324 … while evaluating definitions from `/nix/store/lrxvs4l9bqbgjfz7w9bkfg5zqq442jxc-source/modules/transposition.nix':2526 (stack trace truncated; use '--show-trace' to show the full, detailed trace)2728 error: Nixpkgs 26.11 has dropped support for x86_64-darwin.2930 The 26.05 stable branch still supports x86_64-darwin, and will31 receive security fixes until the end of 2026. If you use channels,32 you can switch to 26.05 as follows:3334 $ sudo nix-channel --add https://nixos.org/channels/nixpkgs-26.05-darwin nixpkgs35 $ sudo nix-channel --update3637 If this doesn’t work, you may need to run:3839 # Lack of sudo is deliberate:40 $ nix-channel --remove nixpkgs4142 If you use flakes, switch your flake input:4344 inputs.nixpkgs = {45 url = "github:NixOS/nixpkgs/nixpkgs-26.05-darwin";46 };4748 See the release notes for more information and alternatives:4950 https://nixos.org/manual/nixpkgs/unstable/release-notes#x86_64-darwin-26.11