前回（uninitialized constant MysqlCompat::MysqlResの対処法参照）はSnow Leopard でしたが、
今回はLionです。
OSのバージョンが変わるたびに問題が起こる気がします。
今回は、以下で回避できるようです。
pre>>
% install_name_tool -change libmysqlclient.18.dylib /usr/local/mysql/lib/libmysqlclient.18.dylib /path/to/rubygems/gems/mysql-2.8.1/lib/mysql_api.bundle
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