Perl - How to generate package on the fly ?

It is a real question, I want to be able to do something like that :

sub generate_package {
 my ($package_name) = @_;
 return q{
   package t;
   use }.$package_name.q{;
   use MooX::Option;

   has 'test' => (is => 'ro');
   1
 }
}

{
  eval(generate_package('Moo'));
  t->new_with_options();
}

I have seen some stuff, like define directly ISA : *{"t::ISA"} = 't';

But how can I add my compiled code ?

If anybody can help me on this, thanks !