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Default Gemfile specifies platforms for rmagick, and database adapter gems. When using Windows, Ruby 2.2.4x64, bundler 1.11;

bundle platform returns:
Your platform is x64-mingw32

so;
bundle install does not install rmagick or database adapter gems because this platform is not included in Gemfile.

When i add @:x64_mingw" to platforms, bundler now sees and installs these gems.

So my Gemfile is like;

platforms :mri, :mingw, :x64_mingw do
  # Optional gem for exporting the gantt to a PNG file, not supported with jruby
  group :rmagick do
    # RMagick 2 supports ruby 1.9
    # RMagick 1 would be fine for ruby 1.8 but Bundler does not support
    # different requirements for the same gem on different platforms
    gem "rmagick", (RUBY_VERSION < "1.9" ? "2.13.3" : ">= 2.0.0")
  end

  # Optional Markdown support, not for JRuby
  group :markdown do
    # TODO: upgrade to redcarpet 3.x when ruby1.8 support is dropped
    gem "redcarpet", "~> 2.3.0" 
  end
end

..
gem "mysql2", "~> 0.3.11", :platforms => [:mri, :mingw, :x64_mingw]
..

Thanks.