these 2 derivations will be built:
  /nix/store/y7w69la1y2rw3srb65hs8rvhm4s49gmc-workmux-0.1.234-vendor.drv
  /nix/store/6y5v86i07bah0wnp6667ksb0kyx0grjp-workmux-0.1.234.drv