Ruby on Rails

first sorry for my poor english.I have a question about sqlite3-ruby on
linux.
I have compiled and installed the ruby 1.9.1, sqlite3 and sqlite3-ruby on
redhat enterprise version.
but when I use irb and import the sqlite3 module, it will throw the error,
what's the matter.

irb(main):001:0> require 'sqlite3'
LoadError: libsqlite3.so.0: cannot open shared object file: No such file or
directory -
/usr/ruby1.9.1/lib/ruby/gems/1.9.1/gems/sqlite3-ruby-1.3.1/lib/sqlite3/sqlite3_native.so
from
/usr/ruby1.9.1/lib/ruby/gems/1.9.1/gems/sqlite3-ruby-1.3.1/lib/sqlite3.rb:6:in
`require'
from
/usr/ruby1.9.1/lib/ruby/gems/1.9.1/gems/sqlite3-ruby-1.3.1/lib/sqlite3.rb:6:in
`rescue in <top (required)>'
from
/usr/ruby1.9.1/lib/ruby/gems/1.9.1/gems/sqlite3-ruby-1.3.1/lib/sqlite3.rb:2:in
`<top (required)>'
from (irb):1:in `require'
from (irb):1
from /usr/ruby1.9.1/bin/irb:12:in `<main>'

thanks

----hywhy
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