There's no doubt some more sophisticated way of doing this, but I'd probably just try to require each package in turn in a string eval. This should give you the idea:

#!/usr/bin/perl

use strict;
use warnings;

my @packages = qw/
    Net::IP
    Net::CIDR
    List::BinarySearch
/;

for my $package (@packages) {
    eval "require $package";
    if ($@) {
        print "Couldn't find package '$package'\n";
    }
    else {
        print "Found package '$package'\n";
    }
}
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