Man pages matching name class::methodmaker::optext in section 3pm:

Class::MethodMaker::OptExt.3pm.en	debian 10 / libclass-methodmaker-perl
Class::MethodMaker::OptExt.3pm.en	debian 11 / libclass-methodmaker-perl
Class::MethodMaker::OptExt.3pm.en	debian 12 / libclass-methodmaker-perl