{
  description = "Simple bot for matrix birthday reminders";

  inputs = {
    flake-parts.url = "github:hercules-ci/flake-parts";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
    devshell.url = "github:numtide/devshell";
  };

  outputs = inputs@{ flake-parts, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      imports = [
        inputs.devshell.flakeModule
        # To import a flake module
        # 1. Add foo to inputs
        # 2. Add foo as a parameter to the outputs function
        # 3. Add here: foo.flakeModule

      ];
      systems =
        [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ];
      perSystem = { config, self', inputs', pkgs, system, ... }:
        let
          sbcl' = pkgs.sbcl.withPackages (ps:
            with ps; [
              dexador
              cl-dotenv
              jonathan
              local-time
              deploy
              cl-yaml
              alexandria
            ]);
        in {
          packages.birthday-boy = pkgs.stdenv.mkDerivation {
            name = "birthday-boy";
            src = ./.;

            nativeBuildInputs = with pkgs; [ openssl sbcl' ];
            dontStrip = true;

            buildPhase = ''
              ${sbcl'}/bin/sbcl --load ./bot.lisp \
                --eval '(sb-ext:save-lisp-and-die #P"birthday-boy" :toplevel #'"'"'birthday-boy:main* :executable t)'
            '';

            installPhase = ''
              mkdir -p $out/bin
              cp birthday-boy $out/bin/_birthday-boy
              chmod +x $out/bin/_birthday-boy


              touch $out/bin/birthday-boy
              echo  "#!/usr/bin/env sh" >> $out/bin/birthday-boy
              echo  "LD_LIBRARY_PATH=\$LD_LIBRARY_PATH:${
                pkgs.lib.makeLibraryPath [ pkgs.openssl pkgs.libyaml ]
              } $out/bin/_birthday-boy \$1" >> $out/bin/birthday-boy

              chmod +x $out/bin/birthday-boy
            '';
          };
          apps.birthday-boy = {
            type = "app";
            program = "${self'.packages.birthday-boy}/bin/birthday-boy";
          };
          devshells.default = {
            env = [ ];
            commands = [ ];
            packages = with pkgs; [ openssl sbcl' ];
          };
        };
      flake = {
        # The usual flake attributes can be defined here, including system-
        # agnostic ones like nixosModule and system-enumerating ones, although
        # those are more easily expressed in perSystem.

      };
    };
}