No binary package for NetBSD 3.1 gnome-session now?

["Kun Niu" <haoniukun%gmail.com@localhost>]

Dear all,
I'm upgrading my NetBSD system.
I deleted my gnome-session at first.
But when I'm trying to install gnome-session binary package, I find
that I can't get such a package at present.
Does it mean that I'll have to compile the package myself?
And when I'm trying to upgrade my netbsd 3.1 system to the current
stable system, I failed to compile wpa.
So my distribution compilation fails.
Has anyone encountered the same problem?

Thanks for any hints in advance.