See [here](https://vcvrack.com/manual/Building)

When `git clone`ing e.g. [AudibleInstruments](https://github.com/VCVRack/AudibleInstruments), use `--recurse-submodules`
```bash
git clone --recurse-submodules https://github.com/VCVRack/AudibleInstruments
```

Make sure `RACK_DIR` points to the Rack SDK. Get the Rack SDK [from here at vcvrack](https://vcvrack.com/downloads/).

For the AudibleInstruments plugins, you can then just run `make`.