Man pages matching name openssl_lh_compfunc in section 3ssl:

OPENSSL_LH_COMPFUNC.3ssl.en	debian 10 / libssl-doc
OPENSSL_LH_COMPFUNC.3ssl.en	debian 11 / libssl-doc
OPENSSL_LH_COMPFUNC.3ssl.en	debian 12 / libssl-doc