these 3 derivations will be built:
  /nix/store/b34vlh1j47rdrnx526zacyzmdyrg1y1c-omp-18.10.3-cargo-vendor-vendor.drv
  /nix/store/vvh8z4wn597bi5gjvpdmm5vp9qsg0c54-omp-18.10.3.drv
  /nix/store/g09cmw7nls5bvmwxw0myf65xl5plsg1c-check-omp.drv