Bastien writes:
>> Not sure if this is of any importance, but since the variable
>> user-emacs-directory (a defconst) exists, maybe org-mode could use it
>> instead of "~/.emacs.d". It seems only relevant for MS-DOS systems,
>> though.
>
> Applied, thanks.

This introduces a regression, since XEmacs doesn't have that variable.
This patch fixes it (apply on master):