$ rails server
/Library/Ruby/Gems/2.0.0/gems/mysql2-0.3.17/lib/mysql2.rb:8:in `require': dlopen(/Library/Ruby/Gems/2.0.0/gems/mysql2-0.3.17/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib (LoadError)
Referenced from: /Library/Ruby/Gems/2.0.0/gems/mysql2-0.3.17/lib/mysql2/mysql2.bundle
Reason: unsafe use of relative rpath libmysqlclient.18.dylib in /Library/Ruby/Gems/2.0.0/gems/mysql2-0.3.17/lib/mysql2/mysql2.bundle with restricted binary - /Library/Ruby/Gems/2.0.0/gems/mysql2-0.3.17/lib/mysql2/mysql2.bundle
from /Library/Ruby/Gems/2.0.0/gems/mysql2-0.3.17/lib/mysql2.rb:8:in `<top (required)>'
from /Library/Ruby/Gems/2.0.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in `require'
from /Library/Ruby/Gems/2.0.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
from /Library/Ruby/Gems/2.0.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in `each'
from /Library/Ruby/Gems/2.0.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in `block in require'
from /Library/Ruby/Gems/2.0.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in `each'
from /Library/Ruby/Gems/2.0.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in `require'
from /Library/Ruby/Gems/2.0.0/gems/bundler-1.10.6/lib/bundler.rb:134:in `require'
from /Users/xxzyjy/zzetao/xxzedu/config/application.rb:7:in `<top (required)>'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:78:in `require'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:78:in `block in server'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:75:in `server'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.2.3/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'OSX 10.11 吧? 试试这个
sudo install_name_tool -change libmysqlclient.18.dylib \
/usr/local/mysql/lib/libmysqlclient.18.dylib \
/Library/Python/2.7/site-packages/_mysql.so