elixir-lang/elixir ? reverse-engineered prompt

I want to get this Elixir repository building cleanly from source on my machine.

Please set it up so I can compile it, run the test suite, and confirm everything is working. If anything is missing, figure out the right steps from the repo docs and update the project so a fresh checkout can be built more easily. I’m especially looking for a simple path to install the needed Erlang version, run the build, and then verify the result with tests.

If there are any platform specific gotchas, especially for Windows or common developer setups, please handle those too or call them out clearly. Keep the changes minimal and make sure the build output and instructions are easy to follow. If you need to check current docs online for the best way to do it, go ahead.