At Mon, 18 Oct 2010 13:54:30 +0200,
Andreas Röhler wrote:
> 
> same here unfortunatly.
> load-path displays the git-org repo, org-mode is loaded from there.
> 
> (require 'org-macs) is present there but
> org-string-nw-p still unknown.
>

The only explanation that makes sense to me is a mixup of old and new
Org files: org-string-nw-p is a regular function and org-macs is
required by org.el

It was added Tue Jul 20 07:54:11 2010 +0200 -- do you have a function:

org-not-nil
(C-h f org-not-nil RET)

and, say, org-plist-delete
(C-h f org-plist-delete RET)

If so, the help shows the file where the function is defined.  Can you
verify that this is the file in the clone of the git repository?

Best,
  -- David

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