al_set_menu_item_flags - Allegro 5 API

       Updates  the  menu  item’s  flags.   See  al_insert_menu_item(3alleg5) for a description of the available
       flags.

       al_set_menu_item_flags - Allegro 5 API

al_get_menu_item_flags(3alleg5), al_toggle_menu_item_flags(3alleg5)

Allegro reference manual                                                         al_set_menu_item_flags(3alleg5)

       5.1.0

              #include <allegro5/allegro_native_dialog.h>

              void al_set_menu_item_flags(ALLEGRO_MENU *menu, int pos, int flags)