these 4 derivations will be built:
  /nix/store/2q66bgkg6v4nfbkdwrxg6cz38xnyb4kq-source.drv
  /nix/store/kvwly2r4p67kp2n2zn5840cr110qvw5a-omp-18.0.6-cargo-vendor-vendor-staging.drv
  /nix/store/apc2skhlbcs7q9xg15m3hgjqw1p21951-omp-18.0.6-cargo-vendor-vendor.drv
  /nix/store/5brxk0jz3rmqx7gg1p4jwyrkdc50p6zx-omp-18.0.6.drv