Man pages matching name d_ctext_proc in section 3alleg4:

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