these 5 derivations will be built:
  /nix/store/78byzgxgqr7c7a1fx7jwsls9nczjwah7-source.drv
  /nix/store/23x37p41b23ynpi7mq9vxk7wv1z2jw95-omp-18.10.0-cargo-vendor-vendor-staging.drv
  /nix/store/2j6n10zyp4ayppqb46kj1b58h7x5g6yi-omp-18.10.0-cargo-vendor-vendor.drv
  /nix/store/3yq9r1fm2yhz9h5h0vr9k4krlpzk0s2z-omp-18.10.0.drv
  /nix/store/zrw71l66qvchsa6by3m5qpdg0ag1jx8z-check-omp.drv