these 4 derivations will be built:
  /nix/store/k04id9gjcl3ac83fh4mk4r07q1p453lw-source.drv
  /nix/store/14drzx9nas5jnb41d7qrjsvrii7gxarp-omp-17.2.15-cargo-vendor-vendor-staging.drv
  /nix/store/c01hhd37301rbybv0zy0qyyp7rzwfxj4-omp-17.2.15-cargo-vendor-vendor.drv
  /nix/store/f3xjshglmgd52yfd88yh3phr2564kgf8-omp-17.2.15.drv