How to install Perl DBI & DBD modules correctly?

PLEASE HELP!

I'm running OS X Snow Leopard 10.6.3 on a MacBook Pro.

Using MacPorts I've installed the following items:
mysql5 @5.1.45_0 (active)
mysql5-server @5.1.45_0 (active)
p5-dbd-mysql @4.013_0+mysql5 (active)
p5-dbi @1.609_0 (active)
perl5.10 @5.10.1_1+darwin (active)

Everything seems to be working, with the exception ofthe Perl DBI module, and the DBD module. Whenever I try to run a Perl program using DBI, I get the following error:

Sun Apr 18 03:18:42 EDT 2010
~/Perl1 ->
peterv@MBP17.local<520>$: db.pl
install_driver(mysql) failed: Can't locate DBD/mysql.pm in @INC (@INC contains: /Library/Perl/Updates/5.10.0 /System/Library/Perl/5.10.0/darwin-thread-multi-2level /System/Library/Perl/5.10.0 /Library/Perl/5.10.0/darwin-thread-multi-2level /Library/Perl/5.10.0 /Network/Library/Perl/5.10.0/darwin-thread-multi-2level /Network/Library/Perl/5.10.0 /Network/Library/Perl /System/Library/Perl/Extras/5.10.0/darwin-thread-multi-2level /System/Library/Perl/Extras/5.10.0 .) at (eval 3) line 3.
Perhaps the DBD::mysql perl module hasn't been fully installed,
or perhaps the capitalisation of 'mysql' isn't right.
Available drivers: DBM, ExampleP, File, Gofer, Proxy, SQLite, Sponge.
at /Users/peterv/Perl1/db.pl line 8

Sun Apr 18 03:18:42 EDT 2010



If anyone can also explain what @INC is (I'm assuming it's some kind of path), how to display its value, and how to set it correctly, I'd appreciate that too! I've been working on this for days, so I'd really be grateful for some help!
Thanks,
Peter V.