these 3 derivations will be built:
  /nix/store/n4aiz0qhhvl57fryz999mil67ipar6xr-ctx-2.3.0-vendor.drv
  /nix/store/cg8kkdk1sccd8i9y1xss84z0rhrkpmwl-ctx-2.3.0.drv
  /nix/store/ka0i4vm1am2pcywg8cdy6rdlcnvb2ijq-check-ctx.drv