{
  description = "A DPS meter for AION 2, in the terminal";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  };

  outputs =
    { nixpkgs, ... }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
        "aarch64-darwin"
      ];
      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
    in
    {
      devShells = forAllSystems (pkgs: {
        # Rust itself comes from rustup, pinned by `rust-toolchain.toml`.
        default = pkgs.mkShell {
          packages = [
            pkgs.rustup

            # Packets are captured with libpcap, which the `pcap` crate links
            # against and finds with pkg-config.
            pkgs.pkg-config
            pkgs.libpcap

            pkgs.just

            # `getcap` and `setcap`, for granting the capture its capability.
            pkgs.libcap
          ];
        };
      });

      formatter = forAllSystems (pkgs: pkgs.nixfmt);
    };
}