Rails - Sep 2009 - about configuration ror (i'm tiro)

hi,

 i''m using ubuntu9.04, download ruby Source code and make it.

 install rails 2.3.4
 $rails /var/www/hello    is work
 but when $ ruby script/generate migration  hello_db

 System tell me:
/usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/initializer.rb:
271:
in `rescue in require_frameworks'': no such file to load -- jopenssl
(RuntimeError)  from

/usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/initializer.rb:
268:in `require_frameworks''  from

/usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/initializer.rb:
134:in `process''  from

/usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/initializer.rb:
113:in `run''  from

/home/lizhixin/NetBeansProjects/hellolizhixin/config/environment.rb:
9:in `<top (required)>''  from

/usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/commands/
generate.rb:1:in `require''  from

/usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/commands/
generate.rb:1:in `<top (required)>''  from

script/generate:3:in `require''  from script/generate:3:in
`<main>''


     thanks