Man pages matching name popup_dialog in section 3alleg4:

popup_dialog.3alleg4.en	debian 10 / allegro4-doc
popup_dialog.3alleg4.en	debian 11 / allegro4-doc
popup_dialog.3alleg4.en	debian 12 / allegro4-doc
popup_dialog.3alleg4.en	debian 13 / allegro4-doc