从一台服务器移动到另一台服务器时，我遇到了 redmine（或 ruby 配置）的问题
redmine@dirty:~/www$ ruby script/rails server webrick -e production
/usr/local/rvm/gems/ruby-2.0.0-p353/gems/mysql2-0.3.14/lib/mysql2.rb:8:in `require': Incorrect MySQL client library version! This gem was compiled for 5.5.17 but the client library is 5.1.59. (RuntimeError)
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/mysql2-0.3.14/lib/mysql2.rb:8:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.2/lib/bundler/runtime.rb:76:in `require'
from /usr/local/rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
from /usr/local/rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.2/lib/bundler/runtime.rb:72:in `each'
from /usr/local/rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.2/lib/bundler/runtime.rb:72:in `block in require'
from /usr/local/rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.2/lib/bundler/runtime.rb:61:in `each'
from /usr/local/rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.2/lib/bundler/runtime.rb:61:in `require'
from /usr/local/rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.2/lib/bundler.rb:131:in `require'
from /home/redmine/redmine-2.4/config/application.rb:7:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.16/lib/rails/commands.rb:53:in `require'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.16/lib/rails/commands.rb:53:in `block in <top (required)>'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.16/lib/rails/commands.rb:50:in `tap'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.16/lib/rails/commands.rb:50:in …