_mysql_init not found when using DataMapper

Question

I have a simple MySQL table:

% mysql -u rampion dev -e 'describe person' +-------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+--------------+------+-----+---------+----------------+ | id | int(11) | NO | UNI | NULL | auto_increment | | uid | varchar(256) | NO | PRI | NULL | | +-------+--------------+------+-----+---------+----------------+ 

And a simple DataMapper script that I want to run:

 # temp.rb require 'rubygems' require 'datamapper' DataMapper::Logger.new($stdout, :debug) DataMapper.setup(:default, "mysql://rampion@localhost/dev") class Person include DataMapper::Resource property :id, Serial property :uid, String end DataMapper.finalize p Person.first_or_create(:uid => 'Steve') 

But when I run it, I get dynamic linker errors:

 % ruby temp.rb ~/.rvm/gems/ruby-1.8.7-p334/gems/dm-validations-1.0.2/lib/dm-validations.rb:33: warning: already initialized constant OrderedHash DataObjects::URI.new with arguments is deprecated, use a Hash of URI components (~/.rvm/gems/ruby-1.8.7-p334/gems/dm-do-adapter-1.0.2/lib/dm-do-adapter/adapter.rb:215:in `new') dyld: lazy symbol binding failed: Symbol not found: _mysql_init Referenced from: ~/.rvm/gems/ruby-1.8.7-p334/gems/do_mysql-0.10.12/lib/do_mysql/do_mysql.bundle Expected in: flat namespace dyld: Symbol not found: _mysql_init Referenced from: ~/.rvm/gems/ruby-1.8.7-p334/gems/do_mysql-0.10.12/lib/do_mysql/do_mysql.bundle Expected in: flat namespace zsh: trace trap ruby temp.rb 

I have LD_LIBRARY_PATH set to /usr/local/mysql/lib where I installed MySQL and it seems to have _mysql_init :

 % grep '_mysql_init' $LD_LIBRARY_PATH/libmysqlclient.18.dylib Binary file /usr/local/mysql/lib/libmysqlclient.18.dylib matches 

I do not know what I need to do to fix this.