these 5 derivations will be built:
  /nix/store/65hfikpmcvxn54gjyrlz8rm3wszca2az-source.drv
  /nix/store/xybv0n9mb5aaxmjfb1v9slvcx9nsz8l7-omp-18.13.1-cargo-vendor-vendor-staging.drv
  /nix/store/sarxddcarn7x4l73izr3imnhlyq864bb-omp-18.13.1-cargo-vendor-vendor.drv
  /nix/store/g26ivn00bq6kw4q017icwj6p1kblsd9m-omp-18.13.1.drv
  /nix/store/yii07liqidkm13d2xvirq7lqrrxpdgjc-check-omp.drv