Man pages matching name allegro_init in section 3alleg4:

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