Not able to install capybara-webkit using bundle install command in Rails 4

Question

I am getting following error while executing command bundle install in my Rails 4 application.

> ruby -v
ruby 2.1.8p440 (2015-12-16 revision 53160) [i386-mingw32]

> 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.

My Gemfile

...
.....
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
.....
...

Error

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.

Note: I already tried to look into a post with similar problem Cannot install capybara-webkit gem and tried to follow the solution by executing the following command. But got following error.

> qmake -v
'qmake' is not recognized as an internal or external command,
operable program or batch file.

Answer 1

Installation instructions are in the capybara-webkit wiki - https://github.com/thoughtbot/capybara-webkit/wiki/Installing-Qt-and-compiling-capybara-webkit . You'll want to install Qt 5.5.1 (5.6 is only supported if you build the QtWebKit module separately)