Solution for "Failed to build gem native extension" with capybara-webkit on Ubuntu

gistfile1.txt

$ bundle install
Fetching source index for http://rubygems.org/
Using rake (0.9.2.2) 
Using ZenTest (4.6.2) 
Using RubyInline (3.11.1) 
Using sexp_processor (3.0.10) 
Using ParseTree (3.0.8) 
Using multi_json (1.0.4) 
Using activesupport (3.1.3) 
Using builder (3.0.0) 
Using i18n (0.6.0) 
Using activemodel (3.1.3) 
Using erubis (2.7.0) 
Using rack (1.3.6) 
Using rack-cache (1.1) 
Using rack-mount (0.8.3) 
Using rack-test (0.6.1) 
Using hike (1.2.1) 
Using tilt (1.3.3) 
Using sprockets (2.0.3) 
Using actionpack (3.1.3) 
Using mime-types (1.17.2) 
Using polyglot (0.3.3) 
Using treetop (1.4.10) 
Using mail (2.3.0) 
Using actionmailer (3.1.3) 
Using activeresource (3.1.3) 
Using addressable (2.2.6) 
Using ansi (1.4.2) 
Using bcrypt-ruby (3.0.1) 
Using nokogiri (1.5.0) 
Using ffi (1.0.11) 
Using childprocess (0.3.1) 
Using rubyzip (0.9.5) 
Using selenium-webdriver (2.19.0) 
Using xpath (0.1.4) 
Using capybara (1.1.2) 
Using json (1.6.5) 
Installing capybara-webkit (0.9.0) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /home/irio/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb 


Gem files will remain installed in /home/irio/.rvm/gems/ruby-1.9.2-p290@my_training/gems/capybara-webkit-0.9.0 for inspection.
Results logged to /home/irio/.rvm/gems/ruby-1.9.2-p290@my_training/gems/capybara-webkit-0.9.0/./gem_make.out
An error occured while installing capybara-webkit (0.9.0), and Bundler cannot continue.
Make sure that `gem install capybara-webkit -v '0.9.0'` succeeds before bundling.


Solution:
$ sudo apt-get install libqt4-dev

sorry, i am asking same question..

i am getting same error even i installed libqt4-dev..
please help me

+1 tnx