Ruby 在ubuntu上安装mongo gem时出错

我正在AmazonEC2实例上运行Ubuntu14.04.3LTS。如果您能帮助解决此错误，我们将不胜感激

键入

sudo gem install mongo

将产生以下结果：

Fetching: bson-3.2.1.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing mongo:
    ERROR: Failed to build gem native extension.

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from extconf.rb:1:in `<main>'


Gem files will remain installed in /var/lib/gems/1.9.1/gems/bson-3.2.1 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/bson-3.2.1/ext/bson/gem_make.out

Fetching:bson-3.2.1.gem（100%）
构建本机扩展。这可能需要一段时间。。。
错误：安装mongo时出错：
错误：无法生成gem本机扩展。
/usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:“require”中：无法加载这样的文件--mkmf（LoadError）
from/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in'require'
来自extconf.rb:1:in`'
Gem文件仍将安装在/var/lib/gems/1.9.1/gems/bson-3.2.1中以供检查。
结果记录到/var/lib/gems/1.9.1/gems/bson-3.2.1/ext/bson/gem_make.out

另一个问题——有一个答案可以帮你解决问题

sudo apt-get install ruby1.9.1-dev

sudo apt-get install ruby-dev

---

看看另一个问题；正如您发布的链接的答案所示，运行sudo apt get install ruby dev修复了错误。非常感谢。如果你贴出答案，我会接受