these 3 derivations will be built:
  /nix/store/lf0xzfqm7n86q5bcd54w74hhjlz7scrp-beads-1.3.1.drv
  /nix/store/00i749szgl791jicmsrcq4vxq89lg6q4-gastown-1.2.1.drv
  /nix/store/yqpx5r83wy4psxvs21q8hj7ij5c56pq9-check-gastown.drv