impl's created an inadvertent dependency

template/lib/package_name.ex.eex

@@ -1,29 +1,28 @@
 defmodule <%= @module_name %> do
   @moduledoc false
-  use Nerves.Package.Platform
+  # This module's only purpose is get rid of error messages when used with Nerves 1.x
+
+  # The functions needed to be implemented when using Nerves.Package.Platform. Implement
+  # anyway, but don't require Nerves.Package.Platform to be around.
+  # use Nerves.Package.Platform
 
-  @impl Nerves.Package.Platform
   def bootstrap(_pkg) do
     :ok
   end
 
-  @impl Nerves.Package.Platform
   def build_path_link(_pkg) do
     # Unused since never built via Nerves tooling
     "Run build.sh directly"
   end
 
-  @impl Nerves.Artifact.BuildRunner
   def build(_pkg, _toolchain, _opts) do
     {:error, "Run build.sh directly"}
   end
 
-  @impl Nerves.Artifact.BuildRunner
   def archive(_pkg, _toolchain, _opts) do
     {:error, "Run build.sh directly"}
   end
 
-  @impl Nerves.Artifact.BuildRunner
   def clean(_pkg) do
     {:error, "Run build.sh directly"}
   end

template/mix.exs.eex

@@ -16,20 +16,12 @@ defmodule <%= @module_name %>.MixProject do
       description: @description,
       package: package(),
       source_url: @source_url,
-      compilers: compilers(Mix.env()),
       nerves_package: nerves_package(),
       deps: deps(),
       docs: docs()
     ]
   end
 
-  # Removing Nerves.Toolchain.CTNG had the side effect of introducing a
-  # circular dependency between Nerves bootstram and compiling the platform.
-  # Since we no longer support compiling the toolchain via the Nerves tooling,
-  # use the environment to see whether this is the root project or not.
-  defp compilers(:prod), do: [:nerves_package | Mix.compilers()]
-  defp compilers(_), do: Mix.compilers()
-
   def application do
     []
   end
@@ -53,7 +45,7 @@ defmodule <%= @module_name %>.MixProject do
   defp deps do
     [
       {:ex_doc, "~> 0.22", only: :docs, runtime: false},
-      {:nerves, "~> 1.13", runtime: false}
+      {:nerves, "~> 1.13 or ~> 2.0", runtime: false}
     ]
   end