{pkgs, ...}: {
  programs.khal = {
    enable = true;
    settings = {
      default = {
        # default_calendar = "fastmail";
      };
      view = {
        agenda_event_format = "{calendar-color}{cancelled}{start-end-time-style} {title}{repeat-symbol}{reset}";
      };
    };
  };
  programs.qcal.enable = true;
  programs.vdirsyncer.enable = true;
  services.vdirsyncer.enable = true;
  accounts.calendar.accounts.fastmail.qcal.enable = true;
}