Man pages matching name textprintf_justify_ex in section 3alleg4:

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