What's the trick with pkgsrc/wip?

[herbert langhans <w3%langhans.com.pl@localhost>]

Hi List,
I didnt search much for this yet, maybe its some easy thing:

With cvs update -dP I use to get the latest packages, that's obvious. My 
PKG_PATH=ftp://ftp.netbsd.org/pub/pkgsrc/packages/NetBSD/$(uname
-m)/5.0/All - I still use NetBSD 5.1.2. It doesn't grab a wsip-directory
from the server ...

But how to get /pkgsrc/wip in an easy way? Is there some cvs method to
download the tree? 

How do you do that? What's the trick? 

Thanks!
herb langhans