Issue #1752670 by salvis: Fixed the instructions to install the external dependencies.
(cherry picked from commit bb257f9268ef87d9e58999b75322828053e2d348)
Issue #1417646 by Cottser, KarinG: Follow-up Fixed Cannot download Mail_Mime from SVN repo via Include module.
(cherry picked from commit f47b8cfb28e8d52bef9f3207f90f71740a934e6d)