{
  description: "A modular Clang C++ development environment";

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

  outputs = { self, nixpkgs, flake-utils, treefmt-nix }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
          config.allowUnfree = true;
        };
        
        # Configuration for LLVM/Clang version
        # Change this to "16", "17", "18", or "19" to switch versions
        llvmVersion = "18";
        
        nixLib = import ./nix {
          inherit pkgs treefmt-nix llvmVersion;
        };
      in
      {
        devShells.default = nixLib.devShell;
        formatter = nixLib.formatter;
      }
    );
}