Is it a ruby bug?

Hi Folks,
Nowdays I program ruby from windows to suse-linux 10.1, when I
compile the ruby source code and make && make install and then install
rails , I can’t start a console. It reports me an error(and this occurs
both in ruby 1.8.5 and ruby 1.8.6 (2007-06-07 patchlevel 36)) :

    from /usr/local/ruby/bin/irb:13

I can’t find a readline.rb in my system. Well, is it a ruby bug and
anybody have ideas on solving this problem ?

 Regards.

                                                                                Tim

both in ruby 1.8.5 and ruby 1.8.6 (2007-06-07 patchlevel 36)) :
[snip]

I can’t find a readline.rb in my system. Well, is it a ruby bug and
anybody have ideas on solving this problem ?

http://wiki.rubyonrails.org/rails/pages/ReadlineLibrary