These configuration files are specifically for the Atreus keyboards created by Phil Hagelberg (@technomancy). This keyboard is available in several variants: powered by a Teensy 2 or STM32F103C8T6 based MCU board (usually hand-wired), powered by an A-Star or ProMicro (usually using a PCB). You will need to use different `make` commands depending on the variant you have; see examples below.
If your keyboard layout is a mirror image of what you expected (i.e. you do not get QWERTY on the left but YTREWQ on the right), then you have an A-Star powered Atreus (older than March 2016) with PCB labels facing *down* instead of up. Specify that by adding `PCBDOWN=yes` to your `make` commands, e.g.
See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).