these 3 derivations will be built:
  /nix/store/p82v0kmncbynjkm826my65qbvlsccqdf-freebuff-linux-x64.tar.gz.drv
  /nix/store/bmzzy9i8xyxkx6n6qzmbdf9qxy0kjf7s-freebuff-0.0.199.drv
  /nix/store/yw4si7an6bib893pqqlxf93hr2fvb9xn-check-freebuff.drv