1error:2 … in the condition of the assert statement3 at «github:NixOS/nixpkgs/716c7a2664ca8325617b8a7fbb609273f2c4cae7?narHash=sha256-zbcZ1dmBTPfJ7Mlqh/yLEPGpgJnwuv4Xr1xucy2WqMA%3D»/lib/customisation.nix:416:13:4 415| drvPath =5 416| assert condition;6 | ^7 417| drv.drvPath;89 … while evaluating the attribute 'handled'10 at «github:NixOS/nixpkgs/716c7a2664ca8325617b8a7fbb609273f2c4cae7?narHash=sha256-zbcZ1dmBTPfJ7Mlqh/yLEPGpgJnwuv4Xr1xucy2WqMA%3D»/pkgs/stdenv/generic/check-meta.nix:727:9:11 726| valid = "no";12 727| handled = handle {13 | ^14 728| inherit attrs meta;1516 (stack trace truncated; use '--show-trace' to show the full, detailed trace)1718 error: Refusing to evaluate package 'gitbutler-0.21.0' in /nix/store/h84gf3axlp9jjzdlykzi65qa5j3w7xa8-source/packages/gitbutler/package.nix:151 because it has an unfree license (‘fsl11Mit’)19 a) To temporarily allow unfree packages, you can use an environment variable20 for a single invocation of the nix tools.2122 $ export NIXPKGS_ALLOW_UNFREE=12324 Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,25 then pass `--impure` in order to allow use of environment variables.2627 b) For `nixos-rebuild` you can set28 { nixpkgs.config.allowUnfree = true; }29 in configuration.nix to override this.3031 Alternatively you can configure a predicate to allow specific packages:32 { nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [33 "gitbutler"34 ];35 }3637 c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add38 { allowUnfree = true; }39 to ~/.config/nixpkgs/config.nix.