these 5 derivations will be built:
  /nix/store/kpyqcv37h3i222mkfjqdfwmdsj7lb0dv-source.drv
  /nix/store/ybs6wjrcs72swc2hlcln9zzzwlc0iidw-omp-18.6.1-cargo-vendor-vendor-staging.drv
  /nix/store/rzkyxvs9nz6dhcwvhyknis07wvs7j96v-omp-18.6.1-cargo-vendor-vendor.drv
  /nix/store/xa7qsycginb7dhippqx6ln5j02kj1d43-omp-18.6.1.drv
  /nix/store/ypfszfi9vs7kwy8w1abi7z9lf7vmbmli-check-omp.drv