configure: error: clang version 3.0 or later is required
when installing ruby 2.3.3 using rvm. Download the Command Line Tools from here:
http://devimages.apple.com/downloads/xcode/command_line_tools_for_xcode_os_x_lion_april_2013.dmg
and install the clang 4.2. I had old 2.1version of clang on my Mac 10.7.5
$ which clang
/usr/bin/clang
clang -v
Apple clang version 2.1 (tags/Apple/clang-163.7.1) (based on LLVM 3.0svn)
Target: x86_64-apple-darwin11.4.2
Thread model: posix
