How can I install Ruby 1.9.3 in Mac OS X Lion?

Question

I am trying to install Ruby 1.9.3 but am having problems. I installed RVM, then typed:

rvm install 1.9.3

The output says:

Answer 1

With the new Feb 2012 Command Line Tools for Xcode, using RVM 1.10.3 (and JweleryBox for Mac) Ruby 1.9.3-p125 compiles fine, without "Use clang" and with shared linking and 64 bit architecture. More over, the "gem install rails" command works flawlessly without the warning about libyaml support.