{
  description = "Aggregate and sync events between CalDAV, Google Calendar and iCal feeds";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

  outputs =
    { self, nixpkgs }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
      ];
      forEachSystem = nixpkgs.lib.genAttrs systems;
      cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
    in
    {
      packages = forEachSystem (
        system:
        let
          pkgs = import nixpkgs { inherit system; };
        in
        rec {
          calcalist = pkgs.rustPlatform.buildRustPackage {
            pname = "calcalist";
            version = cargoToml.package.version;
            src = pkgs.lib.cleanSource ./.;
            cargoLock.lockFile = ./Cargo.lock;

            # tests/caldav.rs spins up radicale and pimsync as real
            # processes; it's a dev-time integration gate (devbox run
            # check), not something a package build should re-run.
            doCheck = false;

            meta = {
              description = cargoToml.package.description;
              license = pkgs.lib.licenses.mit;
              mainProgram = "calcalist";
              platforms = pkgs.lib.platforms.linux;
            };
          };
          default = calcalist;
        }
      );

      apps = forEachSystem (system: rec {
        calcalist = {
          type = "app";
          program = "${self.packages.${system}.calcalist}/bin/calcalist";
        };
        default = calcalist;
      });
    };
}