these 3 derivations will be built:
  /nix/store/7dg24sv5zg2qnfldsishxaj0vf33jdq3-beads-1.3.1.drv
  /nix/store/1w8hyyfgp6idiwganwxmajaypxp328bz-gastown-1.2.1.drv
  /nix/store/ygwg5r8hpcpajkygv971xizww4ms16dz-check-gastown.drv