对于 Ruby on Rails，如何“gem install mysql2”从 Leopard 升级到 Snow Leopard 后？
它总是说：
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.
/Users/peter/.rvm/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb
checking for rb_thread_blocking_region()... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
如果是 sqlite3，会发生类似的事情：
ERROR: Error installing sqlite3:
ERROR: Failed to build gem native extension.
/Users/peter/.rvm/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb
checking for sqlite3.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
更新：至少 sqlite3 正在构建...这是在我rvm删除1.9.2-p180并删除之后所有1.9.2，并通过rvm install 1.9.2重新安装，现在sqlite3可以捆绑安装，但mysql2仍然有问题。
It always says:
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.
/Users/peter/.rvm/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb
checking for rb_thread_blocking_region()... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
similar things happen if it is sqlite3:
ERROR: Error installing sqlite3:
ERROR: Failed to build gem native extension.
/Users/peter/.rvm/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb
checking for sqlite3.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Update: at least sqlite3 is building now... that is after I rvm remove 1.9.2-p180 and removing all the 1.9.2, and reinstall by rvm install 1.9.2 and now sqlite3 can be bundle installed, but mysql2 still has problem.
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我安装了 64 位版本的 MySQL 服务器，它将捆绑安装，然后这个问题帮助解决了
问题： 未加载库：尝试使用 mysql2 gem 在 OS X 10.6 上运行“rails 服务器”时出现 libmysqlclient.16.dylib 错误
I installed the 64 bit version of MySQL server and it will bundle install, and then this question helped with the
solution: Library not loaded: libmysqlclient.16.dylib error when trying to run 'rails server' on OS X 10.6 with mysql2 gem