these 2 derivations will be built:
  /nix/store/sjpmwka4ymxzq9gdbjsh99dyd5xpf0zm-ctx-1.4.10-vendor.drv
  /nix/store/lz1xbz1rjcbcmwl5g5b11p24q8k7lawm-ctx-1.4.10.drv