these 3 derivations will be built:
  /nix/store/47np31zwa5rz6rh1mprrxf9kzq2mjfjn-omp-18.12.6-cargo-vendor-vendor.drv
  /nix/store/8fba4ha20a8q4bfhcmyhfzf9xdmam9k0-omp-18.12.6.drv
  /nix/store/hbr9vqrg1rjhwdyzzzrb6bldwcbyscw1-check-omp.drv