haxefoundation/haxe ? reverse-engineered prompt

I want to work on this Haxe project and get it building from source on my machine. Please set up whatever I need, then help me compile it, run the tests if possible, and make sure the command line tool works after the build.

If there are any missing tools or tricky steps for Windows, macOS, or Linux, please point them out clearly and keep it simple. I’d also like a quick explanation of what the main parts of the project do, like the compiler and the standard library, so I can understand where to make changes later. If anything depends on current build instructions or updated docs, look them up online if you need to.