Why is System Dependencies not showing a place to install Nix packages?

System Dependencies usually works for installing Nix packages but now when I go there it shows this:


Without any place to install one.

Some repls that are older do not have this feature unfortunately (I don’t know why).
You can manually install them yourself, though.

Open your replit.nix file and add packages (prepended with pkgs.) to the deps list (on separate lines, and no commas).
(If there is no replit.nix file, create one.)

Example:

{pkgs}: {
  deps = [
    pkgs.python312
  ];
}