these 5 derivations will be built:
  /nix/store/c3qrryqc1hgqbbsslpvd9syvi6ilxxrh-source.drv
  /nix/store/hxn0v4zd6qs5z066vg4d1iczmld3wkgb-omp-18.12.2-cargo-vendor-vendor-staging.drv
  /nix/store/dpqsslg3pgqfqqclhicc0m6w7ifyqxpw-omp-18.12.2-cargo-vendor-vendor.drv
  /nix/store/2ml24qnnb72gza7capqa9ls1iql3iv31-omp-18.12.2.drv
  /nix/store/xk6gn22d2lp5j6d5vabd7jp9wwrz9sd4-check-omp.drv