Man pages matching name sasl_auxprop_getctx in section 3:

sasl_auxprop_getctx.3.en	debian 10 / libsasl2-dev
sasl_auxprop_getctx.3.en	debian 11 / libsasl2-dev
sasl_auxprop_getctx.3.en	debian 12 / libsasl2-dev