Man pages matching name papi_num_cmp_hwctrs in section 3:

PAPI_num_cmp_hwctrs.3.en	debian 10 / libpapi-dev
PAPI_num_cmp_hwctrs.3.en	debian 11 / libpapi-dev
PAPI_num_cmp_hwctrs.3.en	debian 12 / libpapi-dev