mysql 安装出错

[yujinming]

今天想学习一下ruby下mysql 的使用，安装了gem ，当安装ruby的mysql的驱动时出现下面这个问题
请高手进行解释下
Building native extensions. This could take a while...
ERROR: Error installing mysql:
ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb install mysql
extconf.rb:1:in `require': no such file to load -- mkmf (LoadError)
from extconf.rb:1


Gem files will remain installed in /var/lib/gems/1.8/gems/mysql-2.7 for inspection.
Results logged to /var/lib/gems/1.8/gems/mysql-2.7/gem_make.out
谢谢了