these 3 derivations will be built:
  /nix/store/fn3ys9p18s631vw39565bc669iibmd71-source.drv
  /nix/store/shfrggbbkg52nq98zlzhmk24325ip2ak-vix-0.6.1.drv
  /nix/store/fpsvsnva9bp97dwrn6sfhlyvdi8xfnjr-check-vix.drv