(gobject:define-gflags "GtkCalendarDisplayOptions" calendar-display-options
  (:export t
   :type-initializer "gtk_calendar_display_options_get_type")
  (:show-heading 1)
  (:show-day-names 2)
  (:no-month-change 4)
  (:show-week-numbers 8)
  (:show-details 32))  

:show-heading

Specifies that the month and year should be displayed.

:show-day-name

Specifies that three letter day descriptions should be present.

:no-month-chage

Prevents the user from switching months with the calendar.

:show-week-numbers

Displays each week numbers of the current year, down the left side of the calendar.

:show-details

Just show an indicator, not the full details text when details are provided. See the gtk:calendar-set-detail-func function.