my ($self, @locations) = @_;
my $cfg = $self->_lei_cfg(1);
my $quiet = $self->{opt}->{quiet};
+ my %seen;
for my $loc (@locations) {
my (@unset, @not_found);
for my $l ($loc, _canonicalize($loc)) {
+ next if $seen{$l}++;
my $key = "external.$l.boost";
delete($cfg->{$key});
$self->_config('--unset', $key);