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gemでTo eliminate this warning, please install libyaml and reinstall your ruby.のエラーが出た場合の対処

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環境

  • OSはMac OS X
  • rubyはHomebrewで入れた
  • libyamlはHomebrewで入れた
  • rubyがバージョン毎にいくつか入っていた。
    • 2.0系2つの内1つをメインで使っていた
    • 2.1.1を最近インストールしたが使ってはいない。

エラー内容

$ gem --version と打つも以下の様エラーが表示された。

$ gem -v

/usr/local/Cellar/ruby/2.0.0-p353/lib/ruby/2.0.0/yaml.rb:4:in `<top (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
...

対処方法

取り敢えずlibyamlを再インストール

$ brew uninstall libyaml
...

$ brew install libyaml
...

$ brew doctor
Your system is ready to brew.

使ってないrubyをアンインストール

まず、現在使っているrubyのバージョンを調べる

$ brew witch ruby
/usr/local/Cellar/ruby/2.0.0-p353/bin/ruby

2.0をちゃんとみてる…が、凄いあやしい…

とにかく、最新版のrubyがあやしいので取り敢えずrubyを消す。

$ brew uninstall ruby
Uninstalling /usr/local/Cellar/ruby/2.1.1...

やっぱりおかしい!最新版のrubyが削除された!

$ brew doctor
Your system is ready to brew.

$ gem -v
2.2.2

直ったみたいです。

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