>> I see that gtk2+ is only built for powerpc and amd64,
>> does it not build for alpha?
>
> I am using GTK2 on my 164LX
> ===> lars@ardbeg:~ %pkg_info | grep gtk2
> gtk2+-2.6.7         GIMP Toolkit v2 - libraries for building X11 user interfaces

I don't see it in

ftp://ftp.NetBSD.org/pub/NetBSD/packages/pkgsrc/x11/gtk2/README.html

(Looks like a pkg for i386 appeared recently.)

Another example:

ftp://ftp.NetBSD.org/pub/NetBSD/packages/pkgsrc/graphics/tiff/README.html

i386 and powerpc only

I would think that there would be automagic scripts that build these?
If a package builds for one arch I'd expect it would build for most?