#!/usr/bin/perl -w

use strict;
use warnings;
use Config;
use LWP::Simple;
use XML::LibXML;
use Text::Table;

#use Data::Dumper qw( Dumper );

use constant CPANDEPS_API_TEMPLATE =>
    'http://deps.cpantesters.org/?xml=1;module=%s' . ';perl=%s;pureper
+l=0;os=%s';

#Get the module name
my $wanted_module = shift || die("No module name specified!");

#Get the archname
my $archname = "any+OS";
$archname = "Linux" if ( $Config{archname} =~ /linux/ );
$archname = 'Windows+%28Win32%29' if ( $Config{archname} =~ /^MSWin32/
+ );

#Get the XML for this module
print STDERR "Getting XML...\n";
my $xml_url =
    sprintf( CPANDEPS_API_TEMPLATE, $wanted_module, $Config{version},
    $archname );
my $xml_data = LWP::Simple::get($xml_url);

#Place that into LibXML
my $doc = XML::LibXML->new->load_xml( { string => $xml_data } );

#Get a list of all the required modules
print STDERR "Parsing XML...\n";
my @deps = $doc->getElementsByTagName("dependency");

#print Dumper \@deps;

#Try to require() each one
my %statuses = (
    installed => [],
    missing   => [] );
foreach (@deps) {

    #Get the module name
    my $required_module =
        [ $_->getElementsByTagName("module") ]->[0]->string_value();

    #print Dumper [ $_->getElementsByTagName("module") ]->[0];

    eval("require $required_module;");
    my $col = $@ ? "missing" : "installed";
    push( @{ $statuses{$col} }, $required_module );

}

#Now, we can show which ones we have and don't have
print STDERR "Making table...\n";
my $table = Text::Table->new(qw/ Installed Missing /);

#Create lines for the headers
$table->load( [ map { "-" x length($_) } qw/ Installed Missing / ] );

#Write table
my $i = 0;
while (1) {
    last unless ( $statuses{installed}->[$i] || $statuses{missing}->[$
+i] );
    $table->load(
        [ $statuses{installed}->[$i] || "", $statuses{missing}->[$i] |
+| "" ] );
    $i++;
}

print "\n$table";
[download]

You need XML::LibXML, LWP::Simple, and Text::Table. Yes, it could have been done with less, but those happened to be the first things that came to mind.