Ubuntu上 gem install mongrel , mysql 出错

如果在Ubuntu上 gem install mongrel , mysql 出错，并包含如下的出错信息：

Building native extensions.? This could take a while...
ERROR:? Error installing mongrel:
?? ?ERROR: Failed to build gem native extension.

Building native extensions.? This could take a while...
ERROR:? Error installing mysql:
??? ERROR: Failed to build gem native extension.

可以考虑分别先安装他们的开发包：

sudo apt-get install ruby1.8-dev

sudo apt-get install libmysqlclient16-dev

参见：http://www.dolicapax.org/?p=11

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