'wdm' Gem on Windows 8.1 x64 Ruby 2.1.5 -


i trying learn how testing rspec, capybara & guard. requires me install wdm gem work guard listener on windows.

for reason failing.

can tell me happening here? bit out of league. wdm gem reason not installing:

gemfile:

source 'https://rubygems.org' ruby '2.1.5'  # bundle edge rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.2.1' # use sqlite3 database active record gem 'sqlite3' # use scss stylesheets gem 'sass-rails', '~> 5.0' # use uglifier compressor javascript assets gem 'uglifier', '>= 1.3.0' # use coffeescript .coffee assets , views gem 'coffee-rails', '~> 4.1.0' # see https://github.com/rails/execjs#readme more supported runtimes # gem 'therubyracer', platforms: :ruby  # use jquery javascript library gem 'jquery-rails' # turbolinks makes following links in web application faster. read more: https://github.com/rails/turbolinks gem 'turbolinks' # build json apis ease. read more: https://github.com/rails/jbuilder gem 'jbuilder', '~> 2.0' # bundle exec rake doc:rails generates api under doc/api. gem 'sdoc', '~> 0.4.0', group: :doc  # use activemodel has_secure_password # gem 'bcrypt', '~> 3.1.7'  # use unicorn app server # gem 'unicorn'  # use capistrano deployment # gem 'capistrano-rails', group: :development  group :development, :test   # call 'byebug' anywhere in code stop execution , debugger console   gem 'byebug'   # testing stuff   gem 'rspec-rails'   gem 'capybara'   gem 'guard-rspec'   gem 'wdm'   # access irb console on exception pages or using <%= console %> in views   gem 'web-console', '~> 2.0' end  # windows not include zoneinfo files, bundle tzinfo-data gem gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby] 

what happens when bundle install:

$ bundle install dl deprecated, please use fiddle fetching gem metadata https://rubygems.org/......... fetching version metadata https://rubygems.org/.. resolving dependencies..... using rake 10.4.2 using i18n 0.7.0 using json 1.8.2 using minitest 5.6.0 using thread_safe 0.3.5 using tzinfo 1.2.2 using activesupport 4.2.1 using builder 3.2.2 using erubis 2.7.0 using mini_portile 0.6.2 using nokogiri 1.6.6.2 using rails-deprecated_sanitizer 1.0.3 using rails-dom-testing 1.0.6 using loofah 2.0.1 using rails-html-sanitizer 1.0.2 using actionview 4.2.1 using rack 1.6.0 using rack-test 0.6.3 using actionpack 4.2.1 using globalid 0.3.5 using activejob 4.2.1 using mime-types 2.5 using mail 2.6.3 using actionmailer 4.2.1 using activemodel 4.2.1 using arel 6.0.0 using activerecord 4.2.1 using debug_inspector 0.0.2 using binding_of_caller 0.7.2 using bundler 1.9.4 using columnize 0.9.0 using byebug 4.0.5 using xpath 2.0.0 using capybara 2.4.4 using hitimes 1.2.2 using timers 4.0.1 using celluloid 0.16.0 using coderay 1.1.0 using coffee-script-source 1.9.1.1 using execjs 2.5.2 using coffee-script 2.4.1 using thor 0.19.1 using railties 4.2.1 using coffee-rails 4.1.0 using diff-lcs 1.2.5 using ffi 1.9.8 using formatador 0.2.5 using rb-fsevent 0.9.4 using rb-inotify 0.9.5 using listen 2.10.0 using lumberjack 1.0.9 using nenv 0.2.0 using shellany 0.0.1 using notiffany 0.0.6 using method_source 0.8.2 using slop 3.6.0 using win32console 1.3.2 using pry 0.10.1 using guard 2.12.5 using guard-compat 1.2.1 using rspec-support 3.2.2 using rspec-core 3.2.3 using rspec-expectations 3.2.1 using rspec-mocks 3.2.1 using rspec 3.2.0 using guard-rspec 4.5.0 using multi_json 1.11.0 using jbuilder 2.2.13 using jquery-rails 4.0.3 using sprockets 3.0.2 using sprockets-rails 2.2.4 using rails 4.2.1 using rdoc 4.2.0 using rspec-rails 3.2.1 using sass 3.4.13 using tilt 1.4.1 using sass-rails 5.0.3 using sdoc 0.4.1 using sqlite3 1.3.10 using turbolinks 2.5.3 using tzinfo-data 1.2015.4 using uglifier 2.7.1  gem::ext::builderror: error: failed build gem native extension.      c:/railsinstaller/ruby2.1.0/bin/ruby.exe -r ./siteconf20150425-10244-tjzt35.rb extconf.rb  extconf failed, uncaught signal 11  gem files remain installed in c:/railsinstaller/ruby2.1.0/lib/ruby/gems/2.1.0/gems/wdm-0.1.0 inspection. results logged c:/railsinstaller/ruby2.1.0/lib/ruby/gems/2.1.0/extensions/x86-mingw32/2.1.0/wdm-0.1.0/gem_make.out error occurred while installing wdm (0.1.0), , bundler cannot continue. make sure `gem install wdm -v '0.1.0'` succeeds before bundling. 

make sure have installed devkit,if did not,downloads devkit, click extract , wait until process finished.next, need initialize devkit , bind ruby installation. open favorite command line tool , navigate folder extracted devkit into.auto-detect ruby installations , add them configuration file next step.

ruby dk.rb init 

install devkit, binding ruby installation.

ruby dk.rb install 

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