Man pages matching name num_joysticks in section 3alleg4:

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