my %seenBuilds;

    return if defined $seenBuilds{$build->id};
    $seenBuilds{$build->id} = 1;

        # Note: we also keep the derivations of failed builds so that
        # they can be restarted.

            , finished => 1

        print STDERR "*** looking for the most recent successful builds of current jobs in ",
            $project->name, ":", $jobset->name, "\n";
        # Keep the most recently succeeded build of a current job. Oh
        # I really need to stop using DBIx::Class.
        keepBuild($_, 1) foreach $jobset->builds->search(
            { id => { -in => $jobset->builds->search(
                { finished => 1
                , buildstatus => [0, 6]
                , job => { -in => $jobset->builds->search(
                                { eval => { -in => [@evals] } },
                                { select => "job", distinct => 1, join => "jobsetevalmembers" }
                               )->as_query }
                },
                { group_by => 'job'
                , select => [ { max => 'id', -as => 'm' } ]
                })->as_query }
            },
            { columns => [ @columns ] });