these 2 derivations will be built:
  /nix/store/l1wkd8r7r58a44v3617by6kl9y1g0fvm-ctx-1.1.1-vendor.drv
  /nix/store/c2crxrwzwdkg51mfzhfkg0xch5acpqx4-ctx-1.1.1.drv