It's homebrew, a package repository for OS X. OS X already comes with a ruby interpreter anyway. And this allows anyone to compile from source qemu 2.0.0 without much fuss.

On Thu, May 22, 2014 at 4:44 PM, Jeff Sickel <jas@corpus-callosum.com> wrote:

On May 22, 2014, at 9:39 AM, Rubén Berenguel <ruben@mostlymaths.net> wrote:

From: https://github.com/Homebrew/homebrew/commits/master/Library/Formula/qemu.rb

Ah, ruby, yet another technology I have zero use for on my systems.

-jas