Man pages matching name lzss_pack_data in section 3alleg4:

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