Man pages matching name packfile in section 3alleg4:

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