Yes, protox requires protoc to be available at compile-time. It seems you need a library that generates code as you could just add the generated code to yours. I have some ideas to implement this, but I don’t know when I’ll be able to try those.
In the meantime, if you’re in a hurry, you can use GitHub - elixir-protobuf/protobuf: A pure Elixir implementation of Google Protobuf. · GitHub. It’s not 100% compliant with protobuf specifications, but it will certainly help you to move faster.
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