Evan Travers 0d5a8b048a Instruct macos users to use avr-gcc@7 (#3337)
If you run `brew install avr-gcc`, you get a version that has
compatibility issues with LUFA. I updated the getting started guide for
osx, the qmk_install setup script, and added a section to the FAQ for
folks like me who accidentally updated avr-gcc past 7.
2018-07-07 17:37:37 -07:00
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