[O] org-agenda-files defvar directory "evaluation" ?

['Mash]

Sorry not quite sure how to phrase the problem in the subject line there.

I have the following setup in my .emacs ...

(defvar org-dir "/home/mash/read/org/")

And use it around such as ...

(setq org-directory org-dir)
(setq org-default-notes-file (concat org-dir "mash.org"))

Now I understand that you can specify a directory such as ...

(setq org-agenda-files '("/home/mash/read/org/"))

But how would I do this with the variable?

(setq org-agenda-files '(org-dir))
(setq org-agenda-files '(,(org-dir))

Any ideas as I would like to use it in my capture templates too ...

(setq org-capture-templates
      '(
        ("t" "Test" entry (file+headline (concat org-dir "test.org" "test")
         "* %?")
        ))



Many thanks,

'Mash