use LayerB2;
use LayerB;

##</code><code>##

BEGIN {
    if ($version == 2) {
        eval "use LayerB2";
    } else {
        eval "use LayerB";
    }
    die $@   if  $@;
}

##</code><code>##

use LayerB ( Version=>$version );

##</code><code>##

use LayerB ( Production => 2!=$version );