these 5 derivations will be built:
  /nix/store/yl9nwk910synp2a1cxgkr42zv9kgc0va-source.drv
  /nix/store/rxpypaw2lkka7aris0akfh7nzlf863mv-omp-18.12.5-cargo-vendor-vendor-staging.drv
  /nix/store/54z1zhwnnvwpqcrm6hk3lj6wsl52d84i-omp-18.12.5-cargo-vendor-vendor.drv
  /nix/store/xxjdlz5z0jy2m9k7vpagbfymi2g9fvjr-omp-18.12.5.drv
  /nix/store/x4vsfycn2cz0bxp47r3xhvvqq717min3-check-omp.drv