$ ruby19 -v -r mathn -e 1
ruby 1.9.0 (2006-04-18) [i686-linux]
/usr/local/lib/ruby/1.9/mathn.rb:19:in `remove_method': method `gcd2'
not defined in Integer (NameError)
        from /usr/local/lib/ruby/1.9/mathn.rb:19

-- 
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407