Installing avr-gcc on OS X

The avr-gcc compiler can be installed on OS X via Home Brew. Currently it's not part of any official formula, but it can be install easily enough using taps.

On OS X Mavericks (10.9.1) I simply:

brew tap larsimmisch/avr
brew install avr-libc

It took my Mac a little bit to compile all the build tools, but everything worked out fine.