these 5 derivations will be built:
  /nix/store/js6x198j5v1rq05gffghxflcxjflbz88-source.drv
  /nix/store/k5kgqr5f4hzwf0pgagwq1shs9fym6ny4-omp-18.12.6-cargo-vendor-vendor-staging.drv
  /nix/store/5hyv3nfkir0i9s74s6fgh0cipmgqkhny-omp-18.12.6-cargo-vendor-vendor.drv
  /nix/store/0xs07ls7alq9aki2wlc6bjj1ln9ihd4b-omp-18.12.6.drv
  /nix/store/qxv4mdj8x10cz8cb6zfz26qap4h34nd1-check-omp.drv