these 3 derivations will be built:
  /nix/store/kzbg61nc4bxb1fm5xvpngq7005cfz00b-omp-18.4.6-cargo-vendor-vendor.drv
  /nix/store/gs64pmbawsa7qyilvggys11w25pf7s76-omp-18.4.6.drv
  /nix/store/la9fily8h1bc3ny5lci0ig186q1vy1p7-check-omp.drv