these 3 derivations will be built:
  /nix/store/dmhcq3lzp4gbsbi22yhcrb0v4c04sqsg-freebuff-linux-x64.tar.gz.drv
  /nix/store/c8d3fxfrbsp3mkc373jyx5ipl5lcjy0x-freebuff-0.2.26.drv
  /nix/store/1d9p49izz5fgyrvjvkj5h7f6bpwx0zyq-check-freebuff.drv