See also http://wiki.zmanda.com/index.php/Version_compatibility for notes
on the compatibility of various versions of Amanda.
+General Notes
+-------------
+
+When upgrading, be careful not to allow the new version of Amanda to find
+already-installed libraries from the old version. The safest way to ensure
+this is to move the old libraries out of the way or remove them before
+compiling the new version. There may be more effective ways to do so that are
+specific to your operating system.
+
Upgrading from pre-2.4.0
------------------------