these 3 derivations will be built:
  /nix/store/a43pxr0gwv3wkp0cyhdav7wpmaxdvmxs-freebuff-linux-x64.tar.gz.drv
  /nix/store/8w8s8dnrz0l6jw08a5v74787rvxdi66g-freebuff-0.2.21.drv
  /nix/store/nfqg83gxclwcpz371grxzj336v9mhxx4-check-freebuff.drv