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无法在mac os下通过gem安装mysql的问题
在mac os下通过gem安装mysql时，老是报错：
java代码  
building native extensions.  this could take a while...  
error:  error installing mysql:  
    error: failed to build gem native extension.
/system/library/frameworks/ruby.framework/versions/1.8/usr/bin/ruby extconf.rb  
checking for mysql_query() in -lmysqlclient... no  
checking for main() in -lm... yes  
checking for mysql_query() in -lmysqlclient... no  
checking for main() in -lz... yes  
checking for mysql_query() in -lmysqlclient... no  
checking for main() in -lsocket... no  
checking for mysql_query() in -lmysqlclient... no  
checking for main() in -lnsl... no  
checking for mysql_query() in -lmysqlclient... no  
checking for main() in -lmygcc... no  
checking for mysql_query() in -lmysqlclient... no
貌似是缺少了某些文件导致的，于是看了看/system/library/frameworks/ruby.framework/versions/1.8/usr/bin/ruby extconf.rb发现extconf.rb好像需要mysql的path，于是执行：
java代码  
export path=$path:/usr/local/mysql/bin  
sudo gem install mysql -v '2.8.1'
问题解决：
java代码  
building native extensions.  this could take a while...  
successfully installed mysql-2.8.1  
1 gem installed  
installing ri documentation for mysql-2.8.1...  
installing rdoc documentation for mysql-2.8.1...
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