these 5 derivations will be built:
  /nix/store/rsfq7a3kmc2afb1nc3fm6smvi32jv1x2-source.drv
  /nix/store/kcb4gd2mris79y1s6k8brif2wabi6lcs-omp-18.11.2-cargo-vendor-vendor-staging.drv
  /nix/store/v7acjdkygqadcsjnqdz3kyk4zq63cgi6-omp-18.11.2-cargo-vendor-vendor.drv
  /nix/store/hsvs5lnpp4r4m55s9fnzimhhyg5kc243-omp-18.11.2.drv
  /nix/store/6v7bvybfli5ka4l7zkj5hq4pyvcp1sm8-check-omp.drv