You're probably looking at this because you've forgotten how to compile "this damned firmware". Yep, it's OK, I know.
Don't worry mate! It's really simple:
$> cd tmk_keyboard/keyboard/ergodox
$> brew bundle --verbose
$> make -f Makefile.lufa clean
$> make -f Makefile.lufa asellitt
Unless its not.
if: sh: avr-gcc: command not found
then: export PATH="/usr/local/opt/avr-gcc@6/bin:$PATH"
Then (if you've remembered to open Teensy, you probably will though because you're such a clever fellow), just reboot the keyboard and it will automatically push the new firmware.
Hakky happing!
Your best bud, Past @asellitt
Oh, PS: You will find the rest of README here: http://github.com/tmk/tmk_keyboard
OH! PPS: Thanks for taking care of that for me, I always know I can count on you to get stuff done :D