师弟的ruby出了点问题，启动rails的时候报错：
$ ruby script/server
=> Booting Mongrel (use ‘script/server webrick’ to force WEBrick)
=> Rails 2.1.0 application starting on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment…
Exiting
/usr/local/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/initializer.rb:225:in `require_frameworks’: no such file to load — openssl (RuntimeError)
from /usr/local/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/initializer.rb:113:in `process’
from /usr/local/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/initializer.rb:93:in `send’
from /usr/local/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/initializer.rb:93:in `run’
from /home/xulei/ROR/mybook/config/environment.rb:13
from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require’
…………………….
一大堆错误。
尝试使用apt安装ruby和rails，没想到ubuntu 8.04存在依赖性关系，未遂。看来这件事情将我转到ubuntu的yy想法无情打破。
源码安装ruby和rubygem，然后gem安装rails，还是以上问题，未遂。
google一下，说是先装openssl-dev，然后“reconfigure all the ruby packages from scratch”，一直没理解这个reconfigure是什么意思。后来弄明白了，原来是到ruby的源码目录configure、make和make install，这样就ok了。