Gem not working (Mac OS X Snow Leopard, Ruby 1.9.2)
I just compiled ruby and installes rubygems, mysql2 and rails, which worked quite well. But I get the following error message, whenever I try to start the rails server:
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2.rb:7:in `require': dlopen(/usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib (LoadError) Referenced from: /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle Reason: image not found - /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2.rb:7:in `' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:68:in `require' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:68:in `block (2 levels) in require' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:66:in `each' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:66:in `block in require' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:55:in `each' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:55:in `require' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler.rb:120:in `require' from /Users/filzo/Documents/rails/blog/config/application.rb:7:in `' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/commands.rb:28:in `require' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/commands.rb:28:in `block in ' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/commands.rb:27:in `tap' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/commands.rb:27:in `' from script/rails:6:in `require' from script/rails:6:in `'
I tried several possible solutions (eg this: http://railsforum.com/viewtopic.php?pid=23125#23125 with libmysqlclient.18.dylib); but nothing worked for me. I hope you can help me.
EDIT: It seems like this fixed the problem for me:
sudo install_name_tool -change libmysqlclient.18.dylib /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
Anyway; is it a bug in the MySQL or the ruby-code?
One of the simple and best way is to create a soft link by command -
sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/lib/libmysqlclient.18.dylib
http://rorguide.blogspot.com/2011/07/getting-error-library-not-loaded.html
This appears to be a known (and unfixed!) bug in the MySQL binary distribution.
Whilst running install_name_tool on your mysql2.bundle files will work, if you remove and rebuild them you're back to square one. Also, you'll have to apply this fix to anything else that links against it. A better solution is to fix the problem in the library itself:
$ sudo install_name_tool -id
/usr/local/mysql/lib/libmysqlclient.18.dylib
/usr/local/mysql-5.5.12-osx10.6-x86_64/lib/libmysqlclient.18.dylib
Removing and rebuilding the mysql2 gem:
$ gem uninstall mysql2
$ gem install mysql2
...will pick up the change to the library, and everything should work correctly, without having to tinker with any environment variables.
If you are using RVM (an excellent choice) on Mac OS X - here is the magic command that finally worked for me.
sudo install_name_tool -change libmysqlclient.18.dylib /usr/local/mysql/lib/libmysqlclient.18.dylib /Users/*USERNAME*/.rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
Replace USERNAME in the syntax appropriately as per your current setup. And if your version of mysql gem is different change that as well.
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