these 2 derivations will be built:
  /nix/store/hg06kd9hzc33lyra9i9l4g3nq7wkv0rf-amp-linux-x64.drv
  /nix/store/9s2jiy7gwd4z9zif6hhczhnp2bil7q26-amp-0.0.1786147648-g672f7d.drv