these 4 derivations will be built:
  /nix/store/c74hpjj003k4qivdrnvyybn088i9k5nj-source.drv
  /nix/store/s6kmls8kac0f5ipbaxx2jmv52j4imi64-omp-17.4.2-cargo-vendor-vendor-staging.drv
  /nix/store/4g38ra8k426xlrszq37cxvc50nb1yk7y-omp-17.4.2-cargo-vendor-vendor.drv
  /nix/store/yfj7y2qdzp2r0hv0p1fzj0vrwbjl95d1-omp-17.4.2.drv