I am new to linux and am trying to run the console on a rails app. I get the following:

Loading development environment (Rails 2.3.5)
/usr/local/lib/ruby/1.8/i686-linux/readline.so: libreadline.so.5: cannot open shared object file: No such file or directory - /usr/local/lib/ruby/1.8/i686-linux/readline.so (LoadError)
from /usr/local/lib/ruby/1.8/irb/completion.rb:10
from /usr/local/lib/ruby/1.8/irb/init.rb:252:in `require'
from /usr/local/lib/ruby/1.8/irb/init.rb:252:in `load_modules'
from /usr/local/lib/ruby/1.8/irb/init.rb:250:in `each'
from /usr/local/lib/ruby/1.8/irb/init.rb:250:in `load_modules'
from /usr/local/lib/ruby/1.8/irb/init.rb:21:in `setup'
from /usr/local/lib/ruby/1.8/irb.rb:54:in `start'
from /usr/local/bin/irb:13

When I locate libreadline.so.5, I get the following:
/usr/local/lib/libreadline.so.5.2
/usr/local/lib/libreadline.so.5

I added '/usr/local/lib' to my path.

Any suggestions on why readline.so can't find libreadline.so.5 would be greatly appreciated.