rbenv.sh

> brew update

> ruby-build --definition

> brew install rbenv
> brew install ruby-build
> brew install rbenv-vars
> brew install ctags
> brew install openssl
> brew upgrade readline


> xcodebuild -version
Xcode 4.6.3

> gcc -v
gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)

> clang -v
Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)

XCode で、Preferences → Components → Command Line Tools をダウンロードしてやって、

> RUBY_CONFIGURE_OPTS="--with-readline-dir=$(brew --prefix readline) --with-openssl-dir=/usr/local/opt/openssl" rbenv install 2.0.0-p0



> rbenv version
1.9.3-p194 (set by /Users/kaz/.rbenv/version)rbenv shell 2.0.0-p0

> rbenv global 2.0.0-p195
> rbenv version
2.0.0-p0 (set by RBENV_VERSION environment variable)

> rbenv versions
  system
  1.9.3-p194
* 2.0.0-p0 (set by RBENV_VERSION environment variable)

> rbenv rehash
> ruby -v
ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin11.4.2]

> gem -v 
2.0.0