mxcl/homebrew — pull request #19560 by sferik (2013-05-01 14:44:22+00:00)
Title: ruby-build 20130501

* Cache git clone directory
* Restore -O3 default when building with clang
* Build REE --without-tk on Darwin if X11 is missing
* Pass $RUBY_CONFIGURE_OPTS to REE installer with -c
* Default RBENV_VERSION to the globally-specified Ruby