title: Not able to install capybara-webkit using bundle install command in Rails 4
body: <p>I am getting following error while executing command <code>bundle install</code> in my Rails 4 application.</p>
  
  <pre><code>&gt; ruby -v
  ruby 2.1.8p440 (2015-12-16 revision 53160) [i386-mingw32]
  
  &gt; rails --version
  Could not find gem 'capybara-webkit x86-mingw32' in any of the gem sources listed in your Gemfile or available on this machine.
  Run `bundle install` to install missing gems.
  </code></pre>
  
  <p><strong>My Gemfile</strong></p>
  
  <pre><code>...
  .....
  group :development, :localtesting, :test do
    gem 'sqlite3',     '1.3.11'
    gem 'byebug',      '3.4.0'
    #gem 'web-console', '2.0.0.beta3'
    gem 'spring',      '1.1.3'
    gem 'i18n-tasks'
    gem 'capybara'
    gem 'selenium-webdriver'
    gem 'rspec'
    gem 'rspec-rails'
    gem 'rspec_junit_formatter'
    gem 'capybara-webkit'
  end
  .....
  ...
  </code></pre>
  
  <p><strong>Error</strong></p>
  
  <pre><code>Installing capybara-webkit 1.10.1 with native extensions
  
  Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
  
      C:/RailsInstaller/Ruby2.1.0/bin/ruby.exe extconf.rb
  *** 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
          --without-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=C:/RailsInstaller/Ruby2.1.0/bin/ruby
          --with-gl-dir
          --without-gl-dir
          --with-gl-include
          --without-gl-include=${gl-dir}/include
          --with-gl-lib
          --without-gl-lib=${gl-dir}/lib
          --with-zlib-dir
          --without-zlib-dir
          --with-zlib-include
          --without-zlib-include=${zlib-dir}/include
          --with-zlib-lib
          --without-zlib-lib=${zlib-dir}/lib
  Command 'qmake ' not available
  
  extconf failed, exit code 1
  
  Gem files will remain installed in C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/capybara-webkit-1.10.1 for inspection.
  Results logged to C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/extensions/x86-mingw32/2.1.0/capybara-webkit-1.10.1/gem_make.out
  Using guard-minitest 2.3.1
  Using actionview 4.2.2
  Using composite_primary_keys 8.1.2
  Using friendly_id 5.1.0
  Using paper_trail 4.0.2
  An error occurred while installing capybara-webkit (1.10.1), and Bundler cannot
  continue.
  Make sure that `gem install capybara-webkit -v '1.10.1'` succeeds before
  bundling.
  </code></pre>
  
  <p>Note: I already tried to look into a post with similar problem <a href="https://stackoverflow.com/questions/14638051/cannot-install-capybara-webkit-gem">Cannot install capybara-webkit gem</a> and tried to follow the solution by executing the following command. But got following error.</p>
  
  <pre><code>&gt; qmake -v
  'qmake' is not recognized as an internal or external command,
  operable program or batch file.
  </code></pre>