Net::LDAP compare question

I am writing a perl script to query an ldap database and find users who
do not belong to any mail distribution list. I can run the query just
fine, but my problem is getting only results back for users who do have
an attribute entry for the field "memberOf". Here is my code
listing....

$ldap = Net::LDAP->new( '**************' );

$mesg = $ldap->bind ( "$user",
password => "$password",
version => 3 );

if (!$base) { $base = "ou=****,ou=*****,dc=******,dc=******"; }

if (!$attrs) { $attrs = [ 'memberOf' ]; }

$search = 'mail=*@**********.com';

$result = $ldap->search ( base => "$base",
scope => "sub",
filter => "$search",
attrs => $attrs
);


$href = $result->as_struct;

@arrayOfDNs = keys %$href;

foreach ( @arrayOfDNs ) {
$dn = $_;
$res = $ldap->compare ( $dn,
attr => "$attrs",
value => ''
);
@entries = $res->dn;

foreach $entr ( @enties ) {
$butes = $entr->dn;
print $butes, "\n";
}

print "#-------------------------------\n";
}

$mesg = $ldap->unbind;



This is pretty much a cut/paste of the example given in CPAN, and I
have replaced the actual values of the query with '*' for obvious
reasons. In the lines

foreach ( @arrayOfDNs ) {
$dn = $_;
$res = $ldap->compare ( $dn,
attr => "$attrs",
value => ''
);

is where I am doing my compare statement, but get nothing back. It
should find any ldap entry where the attribute "memberOf" has no entry.
Any help would be appreciated in this.

.

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