I am just getting started learning rails. I am building my first app using

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Editorial Team

Asked: May 16, 20262026-05-16T23:05:17+00:00 2026-05-16T23:05:17+00:00

I am just getting started learning rails. I am building my first app using

0

I am just getting started learning rails.

I am building my first app using Ruby on Rails tutorial by Michael Hartl.

the book said to use this gem file.

source 'http://rubygems.org'

gem 'rails', '3.0.0.rc'
gem 'sqlite3-ruby', '1.2.5', :require => 'sqlite3'

group :development do
     gem 'rspec-rails', '2.0.0.beta.18'
end

group :test do
     gem 'rspec', '2.0.0.beta.18'
end

However I get the following error when I run bundle install in the terminal:

Fetching source index for http://rubygems.org/
Using rake (0.8.7) 
Using abstract (1.0.0) 
Using activesupport (3.0.0.rc) 
Using builder (2.1.2) 
Using i18n (0.4.1) 
Using activemodel (3.0.0.rc) 
Using erubis (2.6.6) 
Using rack (1.2.1) 
Using rack-mount (0.6.13) 
Using rack-test (0.5.4) 
Using tzinfo (0.3.23) 
Using actionpack (3.0.0.rc) 
Using mime-types (1.16) 
Using polyglot (0.3.1) 
Using treetop (1.4.8) 
Using mail (2.2.6.1) 
Using actionmailer (3.0.0.rc) 
Using arel (0.4.0) 
Using activerecord (3.0.0.rc) 
Using activeresource (3.0.0.rc) 
Using bundler (1.0.0) 
Using diff-lcs (1.1.2) 
Installing nokogiri (1.4.3.1) 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