Man pages matching name dbix::searchbuilder::handle::informix in section 3pm:

DBIx::SearchBuilder::Handle::Informix.3pm.en	debian 10 / libdbix-searchbuilder-perl
DBIx::SearchBuilder::Handle::Informix.3pm.en	debian 11 / libdbix-searchbuilder-perl
DBIx::SearchBuilder::Handle::Informix.3pm.en	debian 12 / libdbix-searchbuilder-perl