these 5 derivations will be built:
  /nix/store/2scpggbdxq4z13jsmrv0wnicxbyiswfz-source.drv
  /nix/store/jc7nvdg6glhssqd20rjgxq6b5mw5snf4-omp-18.12.1-cargo-vendor-vendor-staging.drv
  /nix/store/gdwcafymrr8dqk75wsl2nllhyy5d1za4-omp-18.12.1-cargo-vendor-vendor.drv
  /nix/store/fy71x03a2pvhrppkc4z4crgdgxvqncds-omp-18.12.1.drv
  /nix/store/328jp5pakdxd65c728l8lgwch0snmj13-check-omp.drv