eval q| require Text::CSV_XS |;
 
$has_xs = 1 unless ($@);
 
my %xs_prereq;
if ($has_xs) {
    my $xs_version = Text::CSV_XS->VERSION;
    if ($xs_version >= $req_xs_ver) {
        $message = "You have Text::CSV_XS (v.$xs_version), so Text::CSV can work very fast!!";
    }
    else {
        %xs_prereq = ('Text::CSV_XS' => $req_xs_ver);
        $message = "Your Text::CSV_XS version is $xs_version. If you install v.$req_xs_ver,\n"
                 . "Text::CSV will work faster.";
    }
}
else {
    $message = "If you install Text::CSV_XS v.$req_xs_ver, it makes Text::CSV faster.";
}