trying to program XMega on Mac with the usbtiny programmer

I'm trying to get XMega 16E5 running on my MAC (at the moment, I've reproduced your DAC board), but cannot get past installing the brew libraries that you compiled. Here is what I have:

1. Before trying to install them, I checked that my regular avrdude does not want to accept XMega:

2. This is what brew tapping looks like:

Could you tell me how can I get past these problems without having to use other operating system?

Thanks, Ivan