these 3 derivations will be built:
  /nix/store/hfr1fx3qjhprqjw0qcw7cch8ylp0l1rj-omp-18.12.6-cargo-vendor-vendor.drv
  /nix/store/ja9jkjhscb8ca3nchanbi8js7r2x46jm-omp-18.12.6.drv
  /nix/store/azni4hv52zf35q9wsgird2bfp2qb62jp-check-omp.drv