para usuários mac e rbenv:

atualização de cerveja

certifique-se de 2.0.0-p0 na lista

brew upgrade rbenv
brew upgrade ruby-build
rbenv install -l

melhor atualizar essas bibliotecas

brew upgrade openssl
brew upgrade readline

export CONFIGURE_OPTS = “- with-openssl-dir = brew --prefix openssl–with-readline-dir = $ (brew –prefix readline)”

rbenv install 2.0.0-p0

para mac e rvm:
https://coderwall.com/p/tptocq

links:
http://qiita.com/items/05a09296f3633cadac3f
http://d.hatena.ne.jp/hokaccha/20130225/1361751345