Installing Shorewall in Ubuntu

I started off with the simple command:

# apt-get install shorewall shorewall-doc

Thought everything was installed properly.  But I got the following error instead:

# shorewall start

Compiling...

   No shorewall compiler installed

Seems I'm missing one more package:

# apt-get install shorewall-perl

Once the shorewall-perl package is you should get the following output:

# shorewall start

Compiling...

   ERROR: No firewall zone defined

Now read up on configuring Shorewall! :)