{ description = "Dev environment for the Recount Mobile app - written in Kotlin"; inputs = { nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable"; }; outputs = { self, nixpkgs}: let # Generate a user-friendly version number. version = builtins.substring 0 8 self.lastModifiedDate; # System types to support. supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ]; # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'. forAllSystems = nixpkgs.lib.genAttrs supportedSystems; # Nixpkgs instantiated for supported system types. nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; config.allowUnfree = true; } ); in { devShells = forAllSystems (system: let pkgs = nixpkgsFor.${system}; in{ default = pkgs.mkShell { buildInputs = with pkgs; [ android-udev-rules android-studio android-tools ]; }; }); }; }