From: KOSAKI Motohiro Date: 2013-02-10T18:44:25+09:00 Subject: [ruby-core:52102] Re: [ruby-trunk - Bug #7817][Feedback] (Unable to compile Ruby 2.0.0-rc2 on OSX (clang version 2.1) > clang -v returns > > Apple clang version 2.1 (tags/Apple/clang-163.7.1) (based on LLVM 3.0svn) > Target: x86_64-apple-darwin12.2.0 > Thread model: posix I recommend to use latest compiler. Following one works fine at least. Old clang has plenty bugs. Apple clang version 4.0 (tags/Apple/clang-421.0.57) (based on LLVM 3.1svn) Target: x86_64-apple-darwin12.2.0 Thread model: posix