these 5 derivations will be built:
  /nix/store/k1g4mg3nhr0m7qbc6i4vjga1fkbf5bw2-source.drv
  /nix/store/vn3dwlkriib3yc24xz7f5kd74y46q85z-ctx-2.1.0-vendor-staging.drv
  /nix/store/bfrnnjavwflhis6aqzyd0n6895z98bc0-ctx-2.1.0-vendor.drv
  /nix/store/g29gccc3ns0f9fhdy7193kiz5kzr97ca-ctx-2.1.0.drv
  /nix/store/ykc7ilsjk3hmy74pdxilg467g5432qzw-check-ctx.drv