The setup can be done in roughly 5 steps: Still, I do hope it will help you to get up and running quickly. You may need to apply few changes on the way. As I learned myself, that does not mean it will automatically work for you as well. This instructable will guide you through the process of setting Eclipse C++ for AVR programming on a up a brand new OS X Yosemite installation. I reused other instructables and blogs to find my way. Spend couple of hours finding out how it works and then managed to get it working.
Now I wanted to setup Eclipse for AVR once again on OS X Yosemite. Not being an expert in programming, nor in electronics, I have to admit I found it challenging. Some time back I managed to setup Eclipse for AVR programming on both Windows 8 and Ubuntu.