Require vm-search in the org-vm functions.

lisp/ChangeLog

@@ -1,5 +1,7 @@
 2008-11-13  Carsten Dominik  <carsten.dominik@gmail.com>
 
+	* org-vm.el (org-vm-follow-link): Require `vm-search'.
+
 	* org.el (org-up-heading-safe, org-forward-same-level): Always
 	call `org-back-to-heading' instead of `outline-back-to-heading'.
 	(org-back-to-heading): New wrapper around outline-back-to-heading,

lisp/org-vm.el

@@ -111,6 +111,7 @@
     (funcall (cdr (assq 'vm org-link-frame-setup)) folder readonly)
     (sit-for 0.1)
     (when article
+      (require 'vm-search)
       (vm-select-folder-buffer)
       (widen)
       (let ((case-fold-search t))