{
  description = "singh5 discord bot";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    utils.url = "github:numtide/flake-utils";
  };

  outputs =
    inputs@{
      self,
      nixpkgs,
      utils,
    }:
    utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs {
          inherit system;
        };

        src = pkgs.lib.sourceFilesBySuffices ./. [
          ".hh"
          ".cc"
          ".build"
          ".options"
        ];

        llvm = pkgs.llvmPackages_21;

        package =
          { stdenv }:
          stdenv.mkDerivation {
            name = "singh5";
            version = "0.1";
            inherit src;

            outputs = [ "out" ];

            nativeBuildInputs = with pkgs; [
              meson
              ninja
              pkg-config
            ];

            buildInputs = with pkgs; [
              (dpp.override { inherit stdenv; })
              (ffmpeg.overrideAttrs (_: {
                inherit stdenv;
                makeFlags = [
                  "HOSTCC=$\{CC}"
                  "HOSTLD=$\{LD}"
                ];
              }))
            ];
          };

        shell =
          { stdenv }:
          pkgs.mkShell.override { inherit stdenv; } {
            name = "singh5";
            inputsFrom = [ (package { inherit stdenv; }) ];
            packages = with pkgs; [
              llvm.clang-tools
            ];
          };

      in
      {
        packages = rec {
          singh5 = package { stdenv = pkgs.gcc15Stdenv; };
          singh5-clang = package { stdenv = llvm.libcxxStdenv; };
          default = singh5-clang;
        };

        devShells = rec {
          singh5 = shell { stdenv = pkgs.gcc15Stdenv; };
          singh5-clang = shell { stdenv = llvm.libcxxStdenv; };
          default = singh5-clang;
        };

        formatter = pkgs.nixfmt-tree;
      }
    );
}