Man pages matching name allegro_version_str in section 3alleg4:

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