I am trying to make a TODO item dependent on another TODO item from a different heading and while searching for this feature, I stumbled upon org-depend.el.

From the official site docs it seems that I can do exactly that using the BLOCKER/ID properties, but my problem is that I can't seem to find org-depend.el and using (require 'org-depend) gives me a "cannot find file" error.

I have looked inside the org-mode repository and the file is not in the lisp folder. Is it dead?

Links: 

[org-mode Repository](https://code.orgmode.org/bzg/org-mode) 

[org-depend Official Doc](https://orgmode.org/worg/org-contrib/org-depend.html)