Sql driver error message

[Lee Nash]

Hey, 
  I've just installed turba in an effort to get working contacts manager working
with IMP.  I'm trying to use the SQL driver and I'm getting an error when I
try to do a search.  Here is the error:

Fatal error: Call to undefined function: query() in ./lib/Driver/sql.php on line
64

The query function is contained in DB/common.php, which is included by
DB/mysql.php.  I'm guessing that DB.php "is" getting included, but I could
be wrong.  Anyway, any ideas?

-lee