these 3 derivations will be built:
  /nix/store/vwsk2p1v4vcnbkl2xj44yb0wzsfz0v0l-beads-1.3.2.drv
  /nix/store/86smggng1p0pvgca4bw62rysxgccz7p7-gastown-1.2.1.drv
  /nix/store/agxpyj5j20hmmzkpd8qa92v571idj0wg-check-gastown.drv