今天由于升级 rvm，把原来的环境删除掉了，重新安装一套。 结果死活没装上 mysql 这个 gem 操作系统是 Mac OS X Lion

env ARCHFLAGS="-arch x86_64" gem install mysql -v 2.8.1 -- -with-mysql-dir=/usr/local/Cellar/mysql/5.1.49 -with-mysql-lib=/usr/local/Cellar/mysql/5.1.49/lib -with-mysql-include=/usr/local/Cellar/mysql/5.1.49/include  -with-mysql-config=/usr/local/Cellar/mysql/5.1.49/bin/mysql_config


checking for mysql_query() in -lmysqlclient... yes
checking for mysql_ssl_set()... yes
checking for rb_str_set_len()... yes
checking for rb_thread_start_timer()... yes
checking for mysql.h... no
checking for mysql/mysql.h... no
*** 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.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/Users/rain/.rvm/rubies/ree-1.8.7-2012.02/bin/ruby
    --with-mysql-config
    --without-mysql-config
    --with-mysql-dir
    --without-mysql-dir
    --with-mysql-include
    --without-mysql-include=${mysql-dir}/include
    --with-mysql-lib
    --without-mysql-lib=${mysql-dir}/lib
    --with-mysqlclientlib
    --without-mysqlclientlib

我都快给 mysql gem 跪了，每次安装都会有问题。

错误信息里提示找不到 mysql.h 文件，但是这个文件明明是有的

checking for mysql.h... no
checking for mysql/mysql.h... no

/usr/local/Cellar/mysql/5.1.49/include/mysql/mysql.h