JuliaLang/julia ? reverse-engineered prompt

I want this repository to build cleanly from source and be easy to run locally.

Please make it so someone can clone the repo, follow a simple setup, and end up with a working Julia executable they can open in the terminal and use right away. If anything is missing or broken in the current instructions, fix it and make the build and test steps clearer. I’d also like a basic sanity check that confirms the build worked, plus any small fixes needed so the main command line experience feels polished.

If you need to look up current build or dependency docs online, go ahead. Keep the changes focused on making the project easier to compile, test, and use for a first time contributor or user.