Description of problem:
Discovered when testing net::imap as part of RHEL4 async advisory - try 
running the attached reprodurer. With newer ruby version shipped by RH (F7, 
for instance, it runs fine), however, it does spits exceptions.

Version-Release number of selected component (if applicable):
ruby-1.8.1-7.EL4.8.1

How reproducible:
always

Steps to Reproduce:
1. run the attached testcase
  
Actual results:
Resp: #<Net::IMAP:0x2aaaaae40de8>
/usr/lib/ruby/1.8/net/imap.rb:884:in `initialize': undefined method
`verify_mode=' for #<OpenSSL::SSL::SSLSocket:0x2000000000762328>
(NoMethodError)
         from ruby-imaps.rb:7:in `new'
         from ruby-imaps.rb:7

Expected results:
something along the lines of:
S: * OK Gimap ready for requests from 62.40.79.66 z33if1561272ikz