these 5 derivations will be built:
  /nix/store/djpla926n2kx98lka4ds1s5v1w6mpzl5-source.drv
  /nix/store/365hzph4178cmyih88vqlahpbhwqp759-omp-18.11.0-cargo-vendor-vendor-staging.drv
  /nix/store/qq2g9lwy97ry9r1fwc7lp1br203lyrqg-omp-18.11.0-cargo-vendor-vendor.drv
  /nix/store/r14fff2rzxiz7s1h37ivnkig7hm5dsyp-omp-18.11.0.drv
  /nix/store/my0v8lyj0mqnlqv2k9vm70lmgchb0857-check-omp.drv