these 2 derivations will be built:
  /nix/store/75f5xpi1n9s81xx47q38kkcxl45576jj-freebuff-linux-x64.tar.gz.drv
  /nix/store/pxcif0h05l5y8y26py8kp7l988iiwqa6-freebuff-0.0.155.drv