Man pages matching name gss_acquire_cred in section 3:

gss_acquire_cred.3.en	debian 10 / gss-man
gss_acquire_cred.3.en	debian 10 / heimdal-dev
gss_acquire_cred.3.en	debian 11 / gss-man
gss_acquire_cred.3.en	debian 11 / heimdal-dev
gss_acquire_cred.3.en	debian 12 / gss-man
gss_acquire_cred.3.en	debian 12 / heimdal-dev