我有一个rails应用程序。当我运行bundle install时，我看到所有宝石都在安装，并且在我看到此消息的一切结束时。
Bundle complete! 71 Gemfile dependencies, 180 gems now installed.
然而，当我执行rails s时。我收到这条消息：
Ignoring nokogiri-1.6.8 because its extensions are not built. Try: gem pristine nokogiri-1.6.8
Ignoring json-1.8.3 because its extensions are not built. Try: gem pristine json-1.8.3
Ignoring binding_of_caller-0.7.2 because its extensions are not built. Try: gem pristine binding_of_caller-0.7.2
Ignoring bluecloth-2.2.0 because its extensions are not built. Try: gem pristine bluecloth-2.2.0
Could not find libv8-3.16.14.15 in any of the sources
Run `bundle install` to install missing gems.
为什么会这样？我已经运行了bundle install，然后当我使用bundle show json时，我得到了/Users/drubio/.rvm/gems/ruby-2.2.5@ohloh-ui/gems/json-1.8.3
所有其他宝石都是如此。这有什么问题？