Karls-Mac-mini:~ karl$ cpanm -V 
cpanm (App::cpanminus) version 1.5019

Karls-Mac-mini:~ karl$ perlbrew list
* perl-5.16.2

Karls-Mac-mini:~ karl$ which perl
/Users/Karl/perl5/perlbrew/perls/perl-5.16.2/bin/perl

Karls-Mac-mini:~ karl$ cpanm MLDBM
MLDBM is up to date. (2.04)

[download]

cpanm output about the failed tests:

t/assert2.t .......... 
Dubious, test returned 2 (wstat 512, 0x200)
Failed 2/4 subtests 
[download]

assert2.t

use lib 't', 'lib';
use strict;
use warnings;
use Test::More tests => 4;
use IO::All;
use IO_All_Test;

ok(io('t/output/xxx/yyy/zzz.db')->dbm->assert->{foo} = "bar");
ok(-f 't/output/xxx/yyy/zzz.db' or -f 't/output/xxx/yyy/zzz.db.dir');
SKIP: {
    skip "requires MLDBM", 2
      unless eval { require MLDBM; 1};
    ok(io('t/output/xxx/yyy/zzz2.db')->assert->mldbm->{foo} = ["bar"])
+;
    ok(-f 't/output/xxx/yyy/zzz2.db' or -f 't/output/xxx/yyy/zzz.db.di
+r');
}
[download]