[MacRuby-devel] trunk depends on a new LLVM

For those compiling from the repository: MacRuby now requires LLVM 2.9. I tested revision 127367 to be okay, so I recommend this one. The README.rdoc file has been updated with newer instructions. Also, as trunk no longer builds for i386 by default, LLVM doesn't need to be built for it anymore, which results in a much faster build. For those using the nightly builds, we will make sure it gets updated. Laurent