{ inputs = { utils.url = "github:numtide/flake-utils"; }; outputs = { self, nixpkgs, utils }: utils.lib.eachDefaultSystem (system: let pkgs = nixpkgs.legacyPackages.${system}; in { devShell = pkgs.mkShell { buildInputs = with pkgs; [ gcc pkg-config clang-tools gtk4 glib gtk4-layer-shell meson ninja guile gdb ]; }; } ); }