Ruby on Rails server won't start: dyld: lazy symbol binding failed: Symbol not found: _mysql_get_client_info

Question

Environment (Mac OS X 10.7.2 - Lion):

$ ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin10]
$ rails -v
Rails 3.1.3
$ mysql -v
Server version: 5.1.44 

I try running the following but I'm greeted with the same error every time even after applying fixes from all over the web:

$ rails server

dyld: lazy symbol binding failed: Symbol not found: _mysql_get_client_info
Referenced from: /Users/pressplay/.rvm/gems/ruby-1.9.3-p0/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle
Expected in: flat namespace

dyld: Symbol not found: _mysql_get_client_info
Referenced from: /Users/pressplay/.rvm/gems/ruby-1.9.3-p0/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle
Expected in: flat namespace

Trace/BPT trap: 5

Failed attempts at fixing include:

sudo install_name_tool -change libmysqlclient.16.dylib /Applications/MAMP/Library/lib/mysql/libmysqlclient.16.dylib ~/.rvm/gems/ruby-1.9.3-p0/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle

sudo ln -s /Applications/MAMP/Library/lib/mysql/libmysqlclient.18.dylib /usr/lib/libmysqlclient.18.dylib

Answer 1

如果您使用的是rvm / without rvm（只需使用sudo），请使用以下命令解决问题。

rvmsudo ARCHFLAGS="-arch x86_64" gem install mysql2 -- --with-mysql-config=/usr/local/mysql/bin/mysql_config --with-opt-lib=/usr/local/mysql/lib 

Answer 2

Uninstalling mysql2 gem and then installing gem with sudo solved it for me.

gem uninstall mysql2
sudo gem install mysql2

Answer 3

我可以补充一点，你首先需要卸载mysql2 gem，然后按照上面的说明重新安装。

sudo gem uninstall mysql2