Searching for binary rubies, this might take some time. No binary rubies available for: osx/10.8/x86_64/ruby-2.1.0-preview1. Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies. Checking requirements for osx. Can not find compiler and 'make' tool - make sure Xcode and/or Command Line Tools are installed. Requirements installation failed with status: 11.

然后怎么办？是不是跟新 GCC？

Done!!! http://ruby-china.org/topics/9770