I have a NetBSD-2.1_STABLE-i386 box and wanted to build a 3.0
release on it so I did a cvs checkout of netbsd-3-0. The CVS/Tag
file shows 'Tnetbsd-3-0'.  When I build however, I see:

===> Summary of results:
         build.sh command: ./build.sh -u -U -M /opt/obj -R /opt/build/3 tools releasekernel=GENERIC_LAPTOP
         build.sh started: Thu Mar 30 16:34:36 CST 2006
         No nonexistent/bin/nbmake, needs building.
         Bootstrapping nbmake
         MACHINE:          i386
         MACHINE_ARCH:     i386
         TOOLDIR path:     /opt/obj/opt/src/tooldir.NetBSD-2.1_STABLE-i386
         DESTDIR path:     /opt/obj/opt/src/destdir.i386
         RELEASEDIR path:  /opt/build/3
         Created /opt/obj/opt/src/tooldir.NetBSD-2.1_STABLE-i386/bin/nbmake
         makewrapper:      /opt/obj/opt/src/tooldir.NetBSD-2.1_STABLE-i386/bin/nbmake-i386
         Updated /opt/obj/opt/src/tooldir.NetBSD-2.1_STABLE-i386/bin/nbmake-i386
         Tools built to /opt/obj/opt/src/tooldir.NetBSD-2.1_STABLE-i386
         Kernel copy:      /opt/build/3/i386/binary/kernel/netbsd-GENERIC_LAPTOP.gz
         build.sh started: Thu Mar 30 16:34:36 CST 2006
         build.sh ended:   Thu Mar 30 16:35:08 CST 2006
===> .

Nowhere did I specify anything about building a 2.x release, nor
is there anything in my /etc/mk.conf to specify it.

Where does the NetBSD-2.1_STABLE-i386 tag come from and how do I
get rid of it?