I suspect that your code now looks like:

$ldap = new Net::LDAP->('host.edu', port => '389');
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which is incorrect syntax. If you are using indirect object syntax (see perlobj under "Method Invocation"), your code should read:

$ldap = new Net::LDAP('host.edu', port => 389) or die "$@";
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But it is better to use:

$ldap = Net::LDAP->new('host.edu', port => 389) or die "$@";
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(As an aside, remember to check your return values!)

See Indirect object syntax (RE: Beginnings of Online CGI Course) and the thread starting with Re: Object Troubles for discussion about indirect object syntax (and why it is generally a Bad Thing).

--sacked