these 3 derivations will be built:
  /nix/store/mz6azaajg1b0p0ai338a4k22dyp683w4-omp-18.12.6-cargo-vendor-vendor.drv
  /nix/store/xcr1y32dnqcw8dxjsqwamr0aqgjgf080-omp-18.12.6.drv
  /nix/store/sm3xgd1wgwwsvlinj8q0rq13zs931hya-check-omp.drv