New passdb plugins should go into the samba lib directory, (/usr/lib/samba/pdb/
for most distributions). An example would be: /usr/lib/samba/pdb/test.so
+
+Be aware that the SQL and XML based passdb modules have been removed since the
+3.0.23 release. More information of external support for SQL passdb modules
+can be found at http://pdbsql.sourceforge.net/.