Ihor Radchenko <yantar92@posteo.net> writes:

> I have recently been contacted by the current compat.el maintainer
> asking if we are willing to adapt compat.el in Org.

See the attached patch set adding support of compat.el.

I had to update Org's build system to handle third-party packages.
Please, give it a close check (first patch).

The second patch adds the actual Elisp part and replaces some
compatibility functions with what is provided by compat.el.
Note that not all the functions are available in compat.el for now.
Daniel, you might want to take a look.

The last patch adds the necessary explanation for users who install Org
from git. Now, they must install compat.el manually to make Org work.