{
  description = "Advent of Code 2023";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { nixpkgs, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        zig = pkgs.zig_0_11;
        buildZigPackage = import ./nix/build-zig-package.nix {
          inherit (pkgs) stdenv;
          inherit zig;
        };
      in
      {
        devShells = {
          default = pkgs.mkShellNoCC {
            buildInputs = [ zig pkgs.zls ];
          };
          ci = pkgs.mkShellNoCC {
            buildInputs = [ zig ];
          };
        };

        packages.default = buildZigPackage {
          name = "aoc23";
          src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
        };
      });
}