example.nix

let
  builder = "${builtins.storePath <bash>}/bin/bash";
in

{
  # nix-build basic.nix -A foo -I bash=$(nix-build '<nixpkgs>' -A bash --no-out-link)
  foo = derivation {
    name = "foo-0.0.0";
    inherit builder;
    args = ["-c" "echo 42 > $out"];
    system = "x86_64-darwin";
  };

  # nix-build basic.nix -A bar -I bash=$(nix-build '<nixpkgs>' -A bash --no-out-link)
  bar = derivation {
    name = "bar-0.0.0";
    inherit builder;
    args = ["-c" "echo 42 > $out"];
    system = "x86_64-darwin";
    __impureHostDeps = [ "/usr/lib/libSystem.B.dylib" ];
  };
}