{
  description = "Flake-based development environment for C++.";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable"; # unstable Nixpkgs

  outputs =
    { self, ... }@inputs:

    let
      supportedSystems = [
        "x86_64-linux"
        "aarch64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
      ];
      forEachSupportedSystem =
        f:
        inputs.nixpkgs.lib.genAttrs supportedSystems (
          system:
          f {
            pkgs = import inputs.nixpkgs { inherit system; };
          }
        );
    in
    {
      devShells = forEachSupportedSystem (
        { pkgs }:
        {
          default =
            pkgs.mkShell.override
              {
                # Override stdenv in order to change compiler:
                stdenv = pkgs.clangStdenv;
                # Comment the line above if you want GCC
              }
              {
                packages =
                  with pkgs;
                  [
                    clang-tools # IMPORTANT - it **always** MUST stay right above clang
                    clang

                    codespell
                    cppcheck
                    doxygen
                    gtest
                    lcov
                    vcpkg
                    vcpkg-tool

                    # BUILD
                    pkg-config
                    meson
                    ninja
                    just

                    # LIBRARIES
                    libcxx

                    # DEBUGGERS
                    lldb
                  ]
                  ++ (if system == "aarch64-darwin" then [ ] else [ gdb ]);

                  env = {
                    # Tell clangd to use the real clang wrapper that *knows* about include paths.
                    CLANGD_FLAGS = "--query-driver=${pkgs.clang}/bin/clang*";

                    # Ensure Meson picks clang instead of GCC.
                    CC = "${pkgs.clang}/bin/clang";
                    CXX = "${pkgs.clang}/bin/clang++";
                  };
              };
        }
      );

      # Feel free to delete this once the project is initialized.
      templates.default = {
        path = ./.;
        description = "Meson-based C++ project template";
      };
    };
}