I’ve search through Google on how to setup Ruby on Rails Development on Mountain Lion OS and here are some helpful links I’ve found.
http://newbieonruby.com/installing-ruby-and-rails-on-mountain-lion/
http://hathaway.cc/2012/04/how-to-setup-mac-os-x-lion-for-ruby-and-rails-development/
http://blog.wyeworks.com/2012/4/13/my-osx-rails-installation-using-homebrew-and-rbenv-step-by-step/
My setup work with:
- Homebrew
- rbenv
- ruby-build
- bundler
- rails
- MySQL
Hope this one help 
Are you working on mail sending on your local machine and doesn’t want to send an actual email? Try using this one:
Im using Rails 3 in this setup.
1) Create this file under your appname/lib/development_mail_interceptor.rb
class DevelopmentMailInterceptor
def self.delivering_email(message)
message.subject = "#{message.to} #{message.subject}"
message.to = "michael@cebudirectories.com"
end
end
2) Create this file in appname/config/initializers/setup_mail.rb
ActionMailer::Base.smtp_settings = {
:address => "smtp.gmail.com",
:port => 587,
:domain => "example.com",
:user_name => "username",
:password => "password",
:authentication => "plain",
:enable_starttls_auto => true
}
if Rails.env.development?
ActionMailer::Base.default_url_options[:host] = "localhost:3000"
else
ActionMailer::Base.default_url_options[:host] = "example.com"
end
Mail.register_interceptor(DevelopmentMailInterceptor) if Rails.env.development?
Done!
Hope this will help you…
/Users/macmini/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb
Can’t handle 1.9.x yet
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration options:
–with-opt-dir
–with-opt-include
–without-opt-include=${opt-dir}/include
–with-opt-lib
–without-opt-lib=${opt-dir}/lib
–with-make-prog
–without-make-prog
–srcdir=.
–curdir
–ruby=/Users/macmini/.rvm/rubies/ruby-1.9.2-p290/bin/ruby
Gem files will remain installed in /Users/macmini/.rvm/gems/ruby-1.9.2-p290/gems/linecache-0.46 for inspection.
Results logged to /Users/macmini/.rvm/gems/ruby-1.9.2-p290/gems/linecache-0.46/ext/gem_make.out
An error occurred while installing linecache (0.46), and Bundler cannot continue.
Make sure that `gem install linecache -v ’0.46′` succeeds before bundling.
Solution:
In you Gemfile, change ruby-debug to ruby-debug19 and do a bundle install.
Hope it works for you.
A good post about Rails 3 remote links and forms by: Steve Schwartz
http://www.alfajango.com/blog/rails-3-remote-links-and-forms
Thank you Steve 
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