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```

    sudo /usr/lib64/fluent/ruby/bin/fluent-gem update
    
    Updating installed gems
    
    Updating io-console
    ERROR:  Error installing io-console:
        io-console requires Ruby version >= 2.0.0.
    
    Updating nokogiri
    Building native extensions.  This could take a while...
    ERROR:  Error installing nokogiri:
        ERROR: Failed to build gem native extension.
    
            /usr/lib64/fluent/ruby/bin/ruby extconf.rb
    checking if the C compiler accepts ... yes
    Building nokogiri using packaged libraries.
    Using mini_portile version 2.0.0.rc2
    checking for gzdopen() in -lz... no
    zlib is missing; necessary for building libxml2
    *** extconf.rb failed ***
    Could not create Makefile due to some reason, probably lack of
    necessary libraries and/or headers.  Check the mkmf.log file for more
    details.  You may need configuration options.
    
    Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/usr/lib64/fluent/ruby/bin/ruby
        --help
        --clean
        --use-system-libraries
        --enable-static
        --disable-static
        --with-zlib-dir
        --without-zlib-dir
        --with-zlib-include
        --without-zlib-include=${zlib-dir}/include
        --with-zlib-lib
        --without-zlib-lib=${zlib-dir}/lib
        --enable-cross-build
        --disable-cross-build
    
    
    Gem files will remain installed in /usr/lib64/fluent/ruby/lib/ruby/gems/1.9.1/gems/nokogiri-1.6.7.2 for inspection.
    Results logged to /usr/lib64/fluent/ruby/lib/ruby/gems/1.9.1/gems/nokogiri-1.6.7.2/ext/nokogiri/gem_make.out
    
    Updating ohai
        ERROR:  Error installing ohai:
            ohai requires Ruby version >= 2.0.0.
    
    Nothing to update
    
    ruby -v
    ruby 2.0.0p648 (2015-12-16) [x86_64-linux]
    
```

fluentdのアップデートを行うと上記のようなエラーがでます。  
Rubyのバージョン2.0.0以上が必要とでているのですが、`ruby -v`で調べると2.0.0p648なので問題ないように思えます。  
上記のエラーでは何を要求しているのかがわからないので、教えていただけますか？
CC BY-SA 3.0
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question
ruby aws fluentd
EC2にfluentdのプラグインをインストールしたいがエラーがでる
sudo curl -L <https://toolbelt.treasuredata.com/sh/install-redhat-td-
agent2.sh> | sh  
td-agentのバージョンを変更。

<http://docs.fluentd.org/articles/install-by-rpm>
CC BY-SA 3.0
2016-01-22T04:08:47.827
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answer
> zlib is missing; necessary for building libxml2

You need to install missing zlib headers which are required for -lz flag in
order to compile the sources correctly. Install by:

```

    sudo apt-get install libz-dev
    
```

If there is a still problem, on Ubuntu also install these ones:

```

    sudo apt-get install gcc ruby-dev libxslt-dev libxml2-dev zlib1g-dev
    
```
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answer