These configuration files are specifically for the Atreus keyboards created by Phil Hagelberg (@technomancy). This keyboard is available in two variants: one powered by a Teensy 2 (usually hand-wired), one powered by an A-Star (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 [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools), then the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information.