these 5 derivations will be built:
  /nix/store/vblynadnfh7wx7yb3bz15ifyqzqd9jn5-source.drv
  /nix/store/rg9cmq4szjkrd4ynpl92f5b3p96r30zi-omp-18.20.2-cargo-vendor-vendor-staging.drv
  /nix/store/9ydbdriiyfryci69gn6hr0h0g74pk4mi-omp-18.20.2-cargo-vendor-vendor.drv
  /nix/store/ccyprg06q4z6xry0yxhgggrz35yqhnnh-omp-18.20.2.drv
  /nix/store/ivxqrh4chna2z0p6gwy69vgsifdkqcad-check-omp.drv