The optional PlRPC-modules (RPC::PlServer etc) are not installed. 
If you want to use the DBD::Proxy driver and DBI::ProxyServer 
modules, then you'll need to install the RPC::PlServer, RPC::PlClient, 
Storable and Net::Daemon modules. The CPAN Bundle::DBI may help you. 
You can install them any time after installing the DBI. 
You do *not* need these modules for typical DBI usage.