these 4 derivations will be built:
  /nix/store/mq8ri8fzxh40asnqy75w4mazdcnd3xcq-source.drv
  /nix/store/1rc4s9zj2wxn9v0brlpxdi3yq1vm8dh1-omp-17.2.15-cargo-vendor-vendor-staging.drv
  /nix/store/n8lcwm34fd1b6i2wm90a4pxc5zc3m0k5-omp-17.2.15-cargo-vendor-vendor.drv
  /nix/store/hr4vi4lnhp2ny1fclggwy5aiaz132gy0-omp-17.2.15.drv