{ description = "Description for the project"; inputs = { flake-parts.url = "github:hercules-ci/flake-parts"; nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; }; outputs = inputs@{ flake-parts, nixpkgs, ... }: flake-parts.lib.mkFlake { inherit inputs; } { systems = [ "x86_64-linux" "aarch64-darwin" ]; perSystem = { pkgs, system, ... }: { # This sets `pkgs` to a nixpkgs with allowUnfree option set. _module.args.pkgs = import nixpkgs { inherit system; config.allowUnfree = true; }; packages.default = pkgs.hello-unfree; }; }; }