Clone一个新Rails项目到Mac， bundle install 的时候遇到下面的提示
Fetching source index from http://rubygems.org/ Your user account isn‘t allowed to install to the system Rubygems. You can cancel this installation and run: bundle install --path vendor/bundle to install the gems into ./vendor/bundle/, or you can enter your password and install the bundled gems to Rubygems using sudo. Password:
也就是说，rbenv 要往你系统的自带Ruby里面安装gem.
gem list | grep bundler
用上面的命令看看你是否通过rbenv安装了bundler. 如果没有那就对了，所以只能去找系统的ruby了，那么你可能不希望这样。
所以解决办法已经明了：
gem install bundler rbenv rehash
rbenv Your user account isn't allowed to install to the system Rubygems
原文：http://www.cnblogs.com/iosdev/p/4541037.html