Não consigo instalar capybara-webkit no ubuntu 14.04 - ruby-on-rails-3.2, capivara, ubuntu-14.04, capybara-webkit

como posso instalar o capybara-webkit aqui estou usando versos rails / ruby ​​são 3.2.12 / 1.9.3

 Installing capybara-webkit 0.13.0 with native extensions

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

/home/rguda/.rvm/rubies/ruby-1.9.3-p392-railsexpress/bin/ruby -r ./siteconf20151124-3867-3fgy4k.rb extconf.rb
Command "qmake -spec linux-g++" not available

Makefile not found

Gem files will remain installed in /home/rguda/.rvm/gems/ruby-1.9.3-p392-railsexpress@rails3.2.12/gems/capybara-webkit-0.13.0 for inspection.
Results logged to /home/rguda/.rvm/gems/ruby-1.9.3-p392-railsexpress@rails3.2.12/extensions/x86_64-linux/1.9.1/capybara-webkit-0.13.0/gem_make.out
An error occurred while installing capybara-webkit (0.13.0), and Bundler cannot continue.
Make sure that `gem install capybara-webkit -v "0.13.0"` succeeds before bundling.

Respostas:

Instalar qt, a corrida sudo apt-get install libqt4-deve gem install capybara-webkit -v "0.13.0".

Como você tem o erro Error installing capybara-webkit: mime-types-data requires Ruby version >= 2.0, significa que você precisa instalar uma versão anterior da gema, então execute gem install mime-types -v 2.6.2"