these 5 derivations will be built:
  /nix/store/m47ahcyyjazj18c5y6v516ya43aq1jd3-source.drv
  /nix/store/whf73z6ip1gjkyvv06kpnb30xdcax3iz-omp-18.4.12-cargo-vendor-vendor-staging.drv
  /nix/store/qwbkz04h8gwq7clh72d17c275jyhk2j1-omp-18.4.12-cargo-vendor-vendor.drv
  /nix/store/p1z1rwvwpsvz7gzicys15afm1ar3fz3g-omp-18.4.12.drv
  /nix/store/1a7m3in6dpq0g0cwj4wbqbarg0n83ilm-check-omp.drv