these 5 derivations will be built:
  /nix/store/4hxxii5b279dxv9kqgcsqwlr5dck6dga-source.drv
  /nix/store/2pdgr8ds9zspx8z49s1izz35qjngx5p6-omp-18.12.3-cargo-vendor-vendor-staging.drv
  /nix/store/cbkxm2803vam2147p3i7wjqb4j0kykkg-omp-18.12.3-cargo-vendor-vendor.drv
  /nix/store/lbyy4177dx6nxicbzq2ppqyjf76r54k0-omp-18.12.3.drv
  /nix/store/ndjhshn1wi59micwq44qc831n3065s63-check-omp.drv