Question

 Installing mysql2 (0.2.6) with native extensions /Library/Ruby/Site/1.8/rubygems/installer.rb:483:in `build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb 
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework  /Versions/1.8/usr/lib/ruby/ruby.h


Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6 for inspection.  
Results logged to /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/ext/mysql2/gem_make.out
from /Library/Ruby/Site/1.8/rubygems/installer.rb:446:in `each'
from /Library/Ruby/Site/1.8/rubygems/installer.rb:446:in `build_extensions'
from /Library/Ruby/Site/1.8/rubygems/installer.rb:198:in `install'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/source.rb:96:in `install'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/installer.rb:55:in `run'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/spec_set.rb:12:in `each'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/spec_set.rb:12:in `each'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/installer.rb:44:in `run'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/installer.rb:8:in `install'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/cli.rb:226:in `install'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/vendor/thor/task.rb:22:in `send'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/vendor/thor/task.rb:22:in `run'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/vendor/thor.rb:246:in `dispatch'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/lib/bundler/vendor/thor/base.rb:389:in `start'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.10/bin/bundle:13
from /usr/bin/bundle:19:in `load'
from /usr/bin/bundle:19

EDIT

  Mohit-Jains-MacBook-Pro:casecreed mohit$ locate mysql_config
 /Applications/XAMPP/xamppfiles/bin/mysql_config
 /usr/local/mysql-5.5.9-osx10.6-x86_64/bin/mysql_config
 /usr/local/mysql-5.5.9-osx10.6-x86_64/man/man1/mysql_config.1

and after doing what u suggested…

ie

     sudo gem install mysql2 -- –with-mysql-config=/usr/local/mysql-5.5.9-osx10.6-x86_64/bin/mysql_config

here is the error..

    Mohit-Jains-MacBook-Pro:casecreed mohit$ rake db:create
    (in /Users/mohit/projects/casecreed)
    rake aborted!
    dlopen(/Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.16.dylib
      Referenced from: /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
      Reason: image not found - /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
    /Users/mohit/projects/casecreed/Rakefile:4
    (See full trace by running task with --trace

EDIT2

screenshot of whole process after answer was modified..

Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
Couldn't create database for {"reconnect"=>false, "encoding"=>"utf8", "username"=>"root", "adapter"=>"mysql2", "database"=>"the_casecreed_test", "host"=>"localhost", "pool"=>5, "password"=>nil}, charset: utf8, collation: utf8_unicode_ci
Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
Couldn't create database for {"reconnect"=>false, "encoding"=>"utf8", "username"=>"root", "adapter"=>"mysql2", "database"=>"the_casecreed_development", "host"=>"localhost", "pool"=>5, "password"=>nil}, charset: utf8, collation: utf8_unicode_ci

EDIT3

development.yml

EDIT4

Even not able to connect to mysql.

Check this screenshot.

EDIT5

This is the solution but i am not able to understand, why mysql server was not starting..

Screenshot

Answer 1

Try the following, which seems to have worked for others:

1. From the Terminal, run locate mysql_config and identify the path to the mysql_config binary
2. Use that path in the following command to install the gem:sudo gem install mysql2 -- –with-mysql-config=/path/you/identified/above/mysql_config

[Edit]

In response to the new error, e.g.:

Mohit-Jains-MacBook-Pro:casecreed mohit$ rake db:create
(in /Users/mohit/projects/casecreed)
rake aborted!
dlopen(/Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.16.dylib
  Referenced from: /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
  Reason: image not found - /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
/Users/mohit/projects/casecreed/Rakefile:4
(See full trace by running task with --trace

I believe this is due to mysql2 not using the full path to libmysqlclient.16.dylib. Others have had luck with:

sudo install_name_tool -change libmysqlclient.16.dylib /usr/local/mysql/lib/libmysqlclient.16.dylib /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle

However, be sure to replace /usr/local/mysql/lib/libmysqlclient.16.dylib with the path to your own libmysqlclient.16.dylib. I’m not positive what it would be, but you may be able to find it with locate (if not, check around in the lib directory for /usr/local/mysql-5.5.9-osx10.6-x86_64).