Hi all,
there is no need to (require 'org-install) anymore from the maint
and master branches.
When using the Org distribution that comes with Emacs, Emacs will add
Org's autoloaded core functions to [emacs]/lisp/loaddefs.el and the rest
of the autoloaded functions to [emacs]/lisp/org/org-loaddefs.el. This
is an improvement over the present situation, where *all* autoloaded
functions where added to Emacs' loaddefs.el -- too much. This is not
yet in Emacs trunk but will be in Emacs 24.3.
When getting Org as a .tar.gz/.zip archive file, you'll have a file
org-loaddefs.el in the lisp/ directory -- this file is now loaded when
org.el is loaded.
When getting Org from ELPA (either "org" or "org-plus-contrib"),
org-loaddefs.el will also be in the load-path.
When getting Org from git, you *HAVE* to created org-loaddefs.el with
`make autoloads' (which is also run by a simple `make'), otherwise
some needed functions will not be autoloaded.
You can check whether org-loaddefs.el has been correctly been loaded
with M-x org-version RET.
Thanks,