>    How do I get a more "up-to-date" pkgsrc tree?  I have the original tree
>    released with 1.3.

ftp://ftp.netbsd.org/pub/NetBSD-current/tar_files/pkgsrc.tar.gz

You will also need newer versions of bsd.port.mk, bsd.port.subdir.mk,
and bsd.own.mk, which are in the

ftp://ftp.netbsd.org/pub/NetBSD-current/tar_files/src/share.tar.gz

I plan to fix this (having to grab the share archive as well) soon.