Man pages matching name append_filename in section 3alleg4:

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