Produits Entr'ouvert » Authentic 2

Possible fix:

create or replace function bor (boolean, boolean)
  returns boolean as
$body$
select $1 or $2;
$body$ language sql;

create aggregate max(boolean) (
  sfunc=bor,
  stype=boolean,
  initcond=false,
);

This custom aggregate is installed on cresson.