Question

I have Ruby and Rails installed with RVM in a Mac OS X Lion environment.

I made Rails work properly with the mysql2 gem (using the MAMP libs rather than a mysql install). So everything was fine…

Until I’ve tried to write a standalone ruby script (out of a Rails context). And now I can’t get the mysql2 gem to work.

From within the script or from the Ruby command line (irb), the

require "mysql2"

instruction leads to the following error:

1.9.2p290 :001 > require "mysql2"
dyld: lazy symbol binding failed: Symbol not found: _mysql_get_client_info
  Referenced from: /Users/mick/.rvm/gems/ruby-1.9.2-p290/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle
  Expected in: flat namespace

dyld: Symbol not found: _mysql_get_client_info
  Referenced from: /Users/mick/.rvm/gems/ruby-1.9.2-p290/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle
  Expected in: flat namespace

I’ve tried several stuff:

• export DYLD_LIBRARY_PATH=/Applications/MAMP/Library/lib/mysql/:$DYLD_LIBRARY_PATH

• using sudo ln -s /Applications/MAMP/Library/lib/mysql/libmysqlclient.16.dylib /usr/lib/libmysqlclient.16.dylib

Nothing worked. I think I’m gonna cry soon…

Answer 1

Strangely, this happened just today with a co-worker. Here’s what I did to fix it:

gem uninstall mysql2
brew install mysql
gem install mysql2

It was as simple as that. Hope it also works for you!