Install Ruby 1.9.3 on Mavericks
Problem
$ rvm install 1.9.3
Searching for binary rubies, this might take some time.
Found remote file https://rvm.io/binaries/osx/10.9/x86_64/ruby-1.9.3-p448.tar.bz2
Checking requirements for osx.
Installing requirements for osx.
Updating system - using Zsh, can not show progress, be patient...
Error running 'requirements_osx_brew_update_system ruby-1.9.3-p448',
please read /Users/qihuan-piao/.rvm/log/1383014621_ruby-1.9.3-p448/update_system.log
Requirements installation failed with status: 1.
Solution
$ gcc -v
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin13.0.0
Thread model: posix
rvm install 1.9.3 --with-gcc=clang
Reference
http://stackoverflow.com/questions/8139138/how-can-i-install-ruby-1-9-3-in-mac-os-x-lion
