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#Homebrewのインストール

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)”

brew install rbenv
brew install ruby-build
brew install readline

2.2.2をインストールしましょう

CONFIGURE_OPTS="--with-readline-dir=/usr/local" rbenv install 2.2.2
echo 'eval "$(rbenv init -)"' >> .bash_profile

source .bash_profile
rbenv global 2.2.2
$ brew update
$ brew install node 
npm install -g gulp