【Mac, Ruby】MacにrbenvでRubyをインストールする



## 前提

* OSX Yosemite 10.10.1で動作確認をしています
* Homebrewがインストールされている前提です


## rbenv公式サイト

http://rbenv.org/
https://github.com/sstephenson/rbenv

## Homebrewでrbenvをインストール

### rbenvをインストール

	$ brew install rbenv
	==> Downloading https://github.com/sstephenson/rbenv/archive/v0.4.0.tar.gz
	######################################################################## 100.0%
	==> Caveats
	To use Homebrew's directories rather than ~/.rbenv add to your profile:
	  export RBENV_ROOT=/usr/local/var/rbenv
	
	To enable shims and autocompletion add to your profile:
	  if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi
	==> Summary
	?  /usr/local/Cellar/rbenv/0.4.0: 31 files, 152K, built in 4 seconds


### ruby-buildをインストール

	$ brew install ruby-build
	==> Installing dependencies for ruby-build: autoconf, pkg-config, openssl
	==> Installing ruby-build dependency: autoconf
	==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/autoconf-2.69.yosemite.	bottle.1.tar.gz
	######################################################################## 100.0%
	==> Pouring autoconf-2.69.yosemite.bottle.1.tar.gz
	?  /usr/local/Cellar/autoconf/2.69: 70 files, 3.1M
	==> Installing ruby-build dependency: pkg-config
	==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/pkg-config-0.28.yosemite.	bottle.2.tar.gz
	######################################################################## 100.0%
	==> Pouring pkg-config-0.28.yosemite.bottle.2.tar.gz
	?  /usr/local/Cellar/pkg-config/0.28: 10 files, 612K
	==> Installing ruby-build dependency: openssl
	==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/openssl-1.0.1j_1.yosemite	.bottle.tar.gz
	######################################################################## 100.0%
	==> Pouring openssl-1.0.1j_1.yosemite.bottle.tar.gz
	==> Caveats
	A CA file has been bootstrapped using certificates from the system
	keychain. To add additional certificates, place .pem files in
	  /usr/local/etc/openssl/certs
	
	and run
	  /usr/local/opt/openssl/bin/c_rehash
	
	This formula is keg-only, which means it was not symlinked into /usr/local.
	
	Mac OS X already provides this software and installing another version in
	parallel can cause all kinds of trouble.
	
	Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries
	
	Generally there are no consequences of this for you. If you build your
	own software and it requires this formula, you'll need to add to your
	build variables:
	
	    LDFLAGS:  -L/usr/local/opt/openssl/lib
	    CPPFLAGS: -I/usr/local/opt/openssl/include
	
	==> Summary
	?  /usr/local/Cellar/openssl/1.0.1j_1: 431 files, 15M
	==> Installing ruby-build
	==> Downloading https://github.com/sstephenson/ruby-build/archive/v20141222.tar.gz
	######################################################################## 100.0%
	==> ./install.sh
	?  /usr/local/Cellar/ruby-build/20141222: 142 files, 608K, built in 5 seconds
	

### 環境変数の設定

	$ echo 'export PATH="$HOME/.rbenv/shims:$PATH"' >> ~/.bash_profile
	$ echo 'eval "$(rbenv init -)"' >> ~/.bash_profile
	$ source ~/.bash_profile
	

### rbenvのインストールを確認

	$ rbenv -v
	rbenv 0.4.0


## Rubyのインストール

### インストールできるRubyのバージョンを確認

	$ rbenv install -l   # インストールできるRubyのバージョンを確認
	
### Rubyのインストール

	$ rbenv install 2.0.0-p598
	
### デフォルトで利用するバージョンを指定

	$ rbenv global 2.0.0-p598
	

## まとめ

MacOSにrbenvを利用してRubyをインストールする環境を構築しました。