title: Force Perl to work in 32-bit mode
body: <p>We have an old Perl application. Recently we moved to a new server which runs 64-bit Ubuntu. 
  Old application uses pack/unpack functions and bitwise operations and now it fails because bitwise operations return 64-bit integers instead of 32-bit.</p>
  
  <p>Is there a way to force perl into 32-bit mode?
  If not, is there a way to install 32-bit perl on 64-bit machine?</p>
  
  <p>Thanks!</p>