these 3 derivations will be built:
  /nix/store/xkcgzh0wdshk4v96nih1raa3i1i9m3k1-omp-18.6.3-cargo-vendor-vendor.drv
  /nix/store/i6bb7l3md2klw7wrmdsqmyhf4i0k7ian-omp-18.6.3.drv
  /nix/store/izk28g84dv5h0x9qr5yxiry0m76zm33k-check-omp.drv