{
  description = "Toolchain for ESP32";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-20.09";

  outputs = { self, nixpkgs }: {

    packages.x86_64-linux.espressif-esp32-tools = nixpkgs.legacyPackages.x86_64-linux.callPackage ./esp32-tools.nix {};
    packages.aarch64-linux.espressif-esp32-tools = nixpkgs.legacyPackages.aarch64-linux.callPackage ./esp32-tools.nix {};
    packages.x86_64-linux.cntr = nixpkgs.legacyPackages.x86_64-linux.callPackage ./cntr/cntr-aarch64.nix {};
    packages.aarch64-linux.cntr = nixpkgs.legacyPackages.aarch64-linux.callPackage ./cntr/cntr-aarch64.nix {};
  };
}