Unclear instructions for manual installation

I want to install Haxe from the Linux binaries distributed here: https://haxe.org/download/

So far the steps I have followed are:

1. Download and extract the tar.gz file
2. Add extracted folder to path
3. Install neko
4. Export the HAXE_STD_PATH environment variable
...?

None of this is documented anywhere and has led to a lot of trial and error. The official process should be provided somewhere for others to reference.