package main; # mixin

use IO::File qw(whatever);
use Net::.....
use SomethingElse;
use EtCetera;

1;

##</code><code>##

package Everything;

sub import {
     my $pkg = caller;
     eval qq{
          package $pkg;
 
          use This;
          use That;
          use And::So::On;
          1;
     } or die $@;
}
1;