these 3 derivations will be built:
  /nix/store/rqrva65ra6pif61dnyk1hwcyz2cs1inr-omp-18.10.0-cargo-vendor-vendor.drv
  /nix/store/isyjfhflmnz655sgp1s1l3k73dj12bk0-omp-18.10.0.drv
  /nix/store/lmrp9ql25x0bzn3ink8ziq9k675cc63g-check-omp.drv