{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, nixpkgs-unstable, flake-utils }:
  flake-utils.lib.eachDefaultSystem (system: let
    pkgs = import nixpkgs {
      inherit system;
      config.allowUnfree = true;
    };
    pkgs-unstable = import nixpkgs-unstable {
      inherit system;
      config.allowUnfree = true;
    };

    mkShell = pkgs.mkShell.override {
      stdenv = pkgs.stdenvAdapters.useMoldLinker pkgs.stdenv;
    };
  in {
    devShells.default = pkgs.mkShell {
      packages = (with pkgs; [
        # python312Full
      ]) ++ (with pkgs-unstable; [
        uv
      ]);

      # Stop uv from downloading Python binaries automatically if needed.
      # UV_PYTHON_DOWNLOADS = "never";

      # ImportError: libstdc++.so.6: cannot open shared object file: No such file or directory
      LD_LIBRARY_PATH = "${pkgs.stdenv.cc.cc.lib}/lib";
    };
  });
}