Unable to install bundle - ruby-on-rails

Question

I'm following the instruction on the Rails Tutorial Chapter 3. When running the command line bundle install --without production I'm getting:
Bundler could not find compatible versions for gem "sprockets-rails":
In snapshot (Gemfile.lock):
sprockets-rails (2.1.3)
In Gemfile:
sass-rails (= 4.0.1) ruby depends on
sprockets-rails (~> 2.0.0) ruby
Running bundle update will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.
When running bundle update I'm getting:
An error occurred while installing nokogiri (1.6.2.1), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.6.2.1'` succeeds before bundling.
When I run gem install nokogiri -v '1.6.2.1' it complains:
Building native extensions. This could take a while... Building
nokogiri using packaged libraries. ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
/Users/yotamros/.rvm/rubies/ruby-2.1.2/bin/ruby extconf.rb Building
nokogiri using packaged libraries. ----- libiconv is missing. please
visit nokogiri.org/tutorials/installing_nokogiri.html for help with
installing dependencies. ----- * extconf.rb failed *
This is my Gemfile:
source 'https://rubygems.org'
ruby '2.1.2'
#ruby-gemset=railstutorial_rails_4_0
gem 'rails', '4.1.1'
group :development, :test do
gem 'sqlite3', '1.3.8'
gem 'rspec-rails', '2.13.1'
end
group :test do
gem 'selenium-webdriver', '2.35.1'
gem 'capybara', '2.1.0'
end
gem 'sass-rails', '4.0.1'
gem 'uglifier', '2.1.1'
gem 'coffee-rails', '4.0.1'
gem 'jquery-rails', '3.0.4'
gem 'turbolinks', '1.1.1'
gem 'jbuilder', '1.0.2'
group :doc do
gem 'sdoc', '0.3.20', require: false
end
group :production do
gem 'pg', '0.15.1'
gem 'rails_12factor', '0.0.2'
end
Any help would be much appreciated.

Answer 1

I found the solution that worked for me here (by Claudio Poli):
brew reinstall libiconv libxml2 libxslt
gem install nokogiri -- --with-iconv-dir=/usr/local/Cellar/libiconv/1.14/

Answer 2

Try bumping sass-rails to '~> 4.0.3' in your Gemfile. You have it locked to a specific slightly out of date version. For what it's worth, a brand new Rails 4.1.1 project has these gems:
gem 'sass-rails', '~> 4.0.3'
gem 'uglifier', '>= 1.3.0'
gem 'therubyracer', platforms: :ruby
gem 'jquery-rails'
gem 'turbolinks'
(I would have put this in a comment but I'm not that cool yet.)