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use Time::HiRes 1.9;

BEGIN {
    require Time::HiRes;
    Time::HiRes->VERSION(1.9)
    Time::HiRes->import
}

package MyAgent;

...
    push @MyAgent::ISA, 'LWP::UserAgent';
}

package MyAgent;

use parent 'LWP::UserAgent';
BEGIN {LWP::UserAgent->VERSION(6.39)}

package Myagent;

use parent::versioned ['LWP::UserAgent' => 6.39];

use parent::versioned ['LWP::UserAgent' => 6.39],
                      ['Mojo::DOM'      => 7.2 ],
                      'Foo::Base';

use parent::versioned qw(Foo);