these 5 derivations will be built:
  /nix/store/sca7rsxxg2wljhn0lrl7mlpfyf5ql7gd-source.drv
  /nix/store/anmy731rgpbcnzd0w066x6zgk848rr1a-omp-18.12.0-cargo-vendor-vendor-staging.drv
  /nix/store/5c3j5rm1sb432l1jxw90zdys8naphis7-omp-18.12.0-cargo-vendor-vendor.drv
  /nix/store/7s6gnyybilsjkplj3pbwhdn6v1wlhkis-omp-18.12.0.drv
  /nix/store/8bw9qan1zm4i88mzl2cpqk7pqaf0ljzk-check-omp.drv