these 4 derivations will be built:
  /nix/store/izy5kcb059mn6pj6knmr4f81xx8z4sqr-source.drv
  /nix/store/i2djah8kfwjdjzqyf6ailnjvghisy4ks-omp-17.4.2-cargo-vendor-vendor-staging.drv
  /nix/store/i67h0nzh42z3zzix3lkv8zlkhgzi0a8r-omp-17.4.2-cargo-vendor-vendor.drv
  /nix/store/ikr07csd816qy49x4jcl7ag17n3v2wsx-omp-17.4.2.drv