Man pages matching name allegro_fs_entry in section 3alleg5:

ALLEGRO_FS_ENTRY.3alleg5.en	debian 10 / allegro5-doc
ALLEGRO_FS_ENTRY.3alleg5.en	debian 11 / allegro5-doc
ALLEGRO_FS_ENTRY.3alleg5.en	debian 12 / allegro5-doc
ALLEGRO_FS_ENTRY.3alleg5.en	debian 13 / allegro5-doc