armv7 targeting via poudriere-devel: devel/elixir-plug fails for "Unchecked dependencies for environment prod"

From: Mark Millard <marklmi_at_yahoo.com>
Date: Sat, 04 Jun 2022 07:17:35 UTC
Note: This was using an armv7 poudriere jail on a aarch64 machine able to
run armv7 code.

===>  Building for elixir-plug-1.4.5
warning: use Mix.Config is deprecated. Use the Config module instead
  config/config.exs:1

Unchecked dependencies for environment prod:
* mime (/usr/local/lib/elixir/lib/mime)
  could not find an app file at "_build/prod/lib/mime/ebin/mime.app". This may happen if the dependency was not yet compiled or the dependency indeed has no app file (then you can pass app: false as option)
** (Mix) Can't continue due to errors on dependencies
*** Error code 1

Stop.
make: stopped in /usr/ports/devel/elixir-plug
=>> Cleaning up wrkdir

===
Mark Millard
marklmi at yahoo.com