these 5 derivations will be built:
  /nix/store/sawc90dqj7zd7bf6ardcrqvkf3iqyhwv-source.drv
  /nix/store/fnh8bhxcy963vh31vn7mwwca1xdnfr6s-omp-18.12.6-cargo-vendor-vendor-staging.drv
  /nix/store/m9k7vys52xag1r9rzks42c9p2ggb191k-omp-18.12.6-cargo-vendor-vendor.drv
  /nix/store/kq52z4dp7qn9g4r6lhl7gzy2p1y5pjba-omp-18.12.6.drv
  /nix/store/ndw6fp80q7vcgxx74jl5s55bmn56cwwg-check-omp.drv