{
  description = "SIP Discord interconnect";

  inputs = {
    utils.url = "github:numtide/flake-utils";
    devshell.url = "github:numtide/devshell";
    naersk.url = "github:nix-community/naersk";
    rust-overlay.url = "github:oxalica/rust-overlay";
  };

  outputs = {
    self,
    nixpkgs,
    utils,
    naersk,
    devshell,
    rust-overlay,
  }:
    utils.lib.eachDefaultSystem (system: let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [(import rust-overlay)];
      };
      rust = pkgs.rust-bin.stable.latest.default;
      # Override naersk to use our chosen rust version from rust-overlay
      naersk-lib = naersk.lib.${system}.override {
        cargo = rust;
        rustc = rust;
      };
    in rec {
      packages.default = naersk-lib.buildPackage {
        pname = "discosip";
        root = ./.;
        buildInputs = with pkgs; [libopus pkgconfig];
      };

      apps.default = utils.lib.mkApp {drv = packages.default;};

      # Provide a dev env with rust and rls
      devShells.default = let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [devshell.overlay];
        };
      in
        pkgs.devshell.mkShell {
          devshell.packages = with pkgs; [
            (rust.override {extensions = ["rls"];})
            ffmpeg
            (callPackage ./pjsip {inherit (darwin.apple_sdk.frameworks) AppKit;})
            opusTools
            libopus
            pkgconfig
          ];
          # Devshell doesn't do any of the automagic that pkgs.mkshell (thanks to
          # mkderivation) does. So we need to manually tell pkg-config where to find
          # libopus so that we can `cargo build` in our devshell.
          env = [
            {
              name = "PKG_CONFIG_PATH";
              value = "${pkgs.libopus.dev}/lib/pkgconfig";
            }
          ];
        };
      formatter = pkgs.alejandra;
    });
}