{
  description = "A flake for the nextpnr FPGA place and route tool";

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

  outputs = { self, nixpkgs, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [];
        };
        # Define custom overrides or additional packages
        myPythonPackages = pkgs.python3Packages.override {
          overrides = self: super: {
            apycula = super.apycula.override {
              # Place any necessary overrides here
            };
          };
        };
        enableGui = false;
      in
      {
        packages = {
          nextpnr = pkgs.stdenv.mkDerivation {
            pname = "nextpnr";
            version = "0.6";
            src = ./.;

            nativeBuildInputs = [ pkgs.cmake ]
              ++ (pkgs.lib.optional enableGui pkgs.qt6.wrapQtAppsHook);
            buildInputs = [
              (pkgs.boost.override { python = pkgs.python3; enablePython = true; })
              pkgs.python3
              pkgs.eigen
              myPythonPackages.apycula
              pkgs.icestorm
              pkgs.trellis
            ] ++ (pkgs.lib.optional enableGui pkgs.qt6.qtbase)
              ++ (pkgs.lib.optional pkgs.stdenv.cc.isClang pkgs.llvmPackages.openmp);

            cmakeFlags = [
              "-DARCH=generic;ice40;ecp5;gowin"
              "-DBUILD_TESTS=ON"
              "-DICESTORM_INSTALL_PREFIX=${pkgs.icestorm}"
              "-DTRELLIS_INSTALL_PREFIX=${pkgs.trellis}"
              "-DTRELLIS_LIBDIR=${pkgs.trellis}/lib/trellis"
              "-DGOWIN_BBA_EXECUTABLE=${myPythonPackages.apycula}/bin/gowin_bba"
              "-DUSE_OPENMP=ON"
              # warning: high RAM usage
              "-DSERIALIZE_CHIPDBS=OFF"
            ] ++ (pkgs.lib.optional enableGui "-DBUILD_GUI=ON");

            meta = with pkgs.lib; {
              description = "Place and route tool for FPGAs";
              homepage = "https://github.com/yosyshq/nextpnr";
              license = licenses.isc;
              platforms = platforms.all;
              maintainers = with maintainers; [ thoughtpolice emily ];
            };
          };
        };

        packages.default = self.packages.${system}.nextpnr;
      });
}