Datasheet

A slightly different configuration file is needed for Mac:

avrdude.conf (Mac version)

http://adafru.it/cEx

You can also find a Linux version of the avrdude.conf file here:

avrdude.conf (Linux version)

http://adafru.it/dXe

The Long Way

If you want to update your avrdude.conf by hand, its not too hard.

Open up that exact file in your favorite text editor

and find the following text

Industries

https://learn.adafruit.com/introducing-trinket Page 46 of 65