A slightly different configuration file is needed for Mac:
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
#------------------------------------------------------------
# ATtiny85
#------------------------------------------------------------
© Adafruit
Industries
avrdude.conf (Mac version)
http://adafru.it/cEx
https://learn.adafruit.com/introducing-trinket
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