1error:2 … while evaluating a branch condition3 at «string»:23:10:4 22| if !keepName n then {}5 23| else if !builtins.isAttrs c || isDrv c then c6 | ^7 24| else if c ? _type || !(c.recurseForDerivations or true) then {}89 … in the left operand of the OR (||) operator10 at «string»:23:33:11 22| if !keepName n then {}12 23| else if !builtins.isAttrs c || isDrv c then c13 | ^14 24| else if c ? _type || !(c.recurseForDerivations or true) then {}1516 … while evaluating definitions from `/nix/store/ch5n4xdddid5859dy6c4i6lghqyx8016-source/modules/transposition.nix':1718 … while evaluating definitions from `/nix/store/2l0w2riap5nllinmqdqxw2nw2yvy2h7f-source/flake-module.nix':1920 … while evaluating definitions from `/nix/store/2l0w2riap5nllinmqdqxw2nw2yvy2h7f-source/module-options.nix':2122 … while evaluating definitions from `/nix/store/ch5n4xdddid5859dy6c4i6lghqyx8016-source/modules/transposition.nix':2324 … while evaluating definitions from `/nix/store/2dgdh3ac19lvfy5glhckv69waqigxfs1-source/flake.nix, via option perSystem':2526 … while evaluating definitions from `/nix/store/2l0w2riap5nllinmqdqxw2nw2yvy2h7f-source/module-options.nix':2728 … while evaluating the module argument `pkgs' in "/nix/store/2l0w2riap5nllinmqdqxw2nw2yvy2h7f-source/module-options.nix":2930 … noting that argument `pkgs` is not externally provided, so querying `_module.args` instead, requiring `config`3132 … while evaluating definitions from `/nix/store/2l0w2riap5nllinmqdqxw2nw2yvy2h7f-source/flake-module.nix':3334 … while evaluating the option `perSystem.x86_64-darwin.treefmt.pkgs':3536 … while evaluating the module argument `pkgs' in ":anon-10:anon-1":3738 (7 duplicate frames omitted)3940 … while evaluating the module argument `pkgs' in ":anon-12:anon-1":4142 … noting that argument `pkgs` is not externally provided, so querying `_module.args` instead, requiring `config`4344 … while evaluating definitions from `/nix/store/ch5n4xdddid5859dy6c4i6lghqyx8016-source/modules/transposition.nix':4546 (stack trace truncated; use '--show-trace' to show the full, detailed trace)4748 error: Nixpkgs 26.11 has dropped support for x86_64-darwin.4950 The 26.05 stable branch still supports x86_64-darwin, and will51 receive security fixes until the end of 2026. If you use channels,52 you can switch to 26.05 as follows:5354 $ sudo nix-channel --add https://nixos.org/channels/nixpkgs-26.05-darwin nixpkgs55 $ sudo nix-channel --update5657 If this doesn’t work, you may need to run:5859 # Lack of sudo is deliberate:60 $ nix-channel --remove nixpkgs6162 If you use flakes, switch your flake input:6364 inputs.nixpkgs = {65 url = "github:NixOS/nixpkgs/nixpkgs-26.05-darwin";66 };6768 See the release notes for more information and alternatives:6970 https://nixos.org/manual/nixpkgs/unstable/release-notes#x86_64-darwin-26.11