these 5 derivations will be built:
  /nix/store/8afqd4w993xlnkjkii5l5jny1rx2lwn2-source.drv
  /nix/store/c9a3i71ljwxn295fbijg84avc0j1lnr9-ck-0.8.1-vendor-staging.drv
  /nix/store/x84w7x1lkx2m861r80sd44b5yvqnp749-ck-0.8.1-vendor.drv
  /nix/store/nw4sqcsirkxv1zswx2qjdm9a4byn73fb-ck-0.8.1.drv
  /nix/store/4lh8q8v7b8xjflzzgqhzrmrg2jxs5mkw-check-ck.drv