Uninitialized constant MysqlCompat::MysqlRes

Note: I'm using Mac OS X Version: 10.6.3

Open the Terminal.

First removed all mysql gems:

• gem uninstall mysql

After removing the mysql gem run the following:

sudo env ARCHFLAGS="-arch x86_64" gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config