在Rails捆绑安装上出现错误

Question

安装json（1.8.6）时发生错误，并且Bundler无法继续。 捆绑之前，请确保gem install json -v '1.8.6'成功。

在Gemfile中：

rails解析为4.2.6，具体取决于

actionmailer was resolved to 4.2.6, which depends on
  actionpack was resolved to 4.2.6, which depends on
    actionview was resolved to 4.2.6, which depends on
      rails-dom-testing was resolved to 1.0.9, which depends on
        rails-deprecated_sanitizer was resolved to 1.0.3, which depends on
          activesupport was resolved to 4.2.6, which depends on
            json

Gem :: Ext :: BuildError：错误：无法构建gem本机扩展。

current directory: /tmp/bundler20180201-46774-s2jlm4json-1.8.6/gems/json-1.8.6/ext/json/ext/generator
/usr/bin/ruby2.3 -r ./siteconf20180201-46774-16pojxx.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

这是什么意思以及如何纠正它。我已经尝试过更新和升级方法，是否还有其他方法可以删除某些依赖项。

Answer 1

如有必要，请尝试更新源列表，否则请删除最近安装的大多数文件，然后从头开始全新安装。 如果需要，分别安装每个固定的包装

sudo apt-get uprade 

也可以。

Answer 2

尝试这个：

bundle update

如果发生捆扎器错误

gem install bundler  #After that run below command too.

bundle install