With the following command,

./build.sh -m vax -V CHECKFLIST_FLAGS="-e -m" -j4 -R /usr/snapshot release

the build dies here:

--- work.built ---
[ "instbin /u0/work/netbsd-current/src/distrib/miniroot/install.sub /u0/work/netbsd-current/src/distrib/miniroot/install.sh /u0/work/netbsd-current/src/distrib/miniroot/upgrade.sh /u0/work/netbsd-current/src/sys/conf/osrelease.sh /u0/work/netbsd-current/src/etc/group /u0/work/netbsd-current/src/etc/master.passwd /u0/work/netbsd-current/src/etc/netconfig /u0/work/netbsd-current/src/etc/protocols /u0/work/netbsd-current/src/etc/services /u0/work/netbsd-current/src/distrib/miniroot/../vax/miniroot/../install.md /u0/work/netbsd-current/src/distrib/miniroot/../vax/miniroot/dot.profile /u0/work/netbsd-current/src/obj/destdir.vax/etc/disktab /u0/work/netbsd-current/src/obj/destdir.vax/usr/mdec/boot /u0/work/netbsd-current/src/sys/arch/vax/compile/obj/GENERIC/netbsd /u0/work/netbsd-current/src/share/termcap/termcap.src work.spec /u0/work/netbsd-current/src/distrib/common/parselist.awk /u0/work/netbsd-current/src/distrib/miniroot/list /u0/work/netbsd-current/src/distrib/miniroot/../v!
ax/miniroot/list /u0/work/netbsd-current/src/distrib/common/list.sysinst" = instbin -a -f work.built -a work.built -nt instbin ]  || {  echo "Building tree into work";  rm -rf work work.built;  mkdir -m 755 work &&   /u0/work/netbsd-current/src/obj/tooldir.NetBSD-1.6ZG-i386/bin/nbmtree -def work.spec -p work/ -UW &&  ARCHDIR=/u0/work/netbsd-current/src/distrib/miniroot/../vax/miniroot  DISTRIBREV=16ZH  DISTRIBVER=1.6ZH  KERNOBJDIR=/u0/work/netbsd-current/src/sys/arch/vax/compile/obj NETBSDSRCDIR=/u0/work/netbsd-current/src  CRUNCHBIN=instbin  CURDIR=/u0/work/netbsd-current/src/distrib/miniroot  DESTDIR=/u0/work/netbsd-current/src/obj/destdir.vax  DISTRIBDIR=/u0/work/netbsd-current/src/distrib  MACHINE=vax  MACHINE_ARCH=vax  MAKE=/u0/work/netbsd-current/src/obj/tooldir.NetBSD-1.6ZG-i386/bin/nbmake  OBJDIR=/u0/work/netbsd-current/src/distrib/miniroot/obj TARGETDIR=/u0/work/netbsd-current/src/distrib/miniroot/obj/work awk -f /u0/work/netbsd-current/src/distrib/common/parselist.!
awk -v mode=populate /u0/work/netbsd-current/src/distrib/miniroot/list /u0/work/netbsd-current/src/distrib/miniroot/../vax/miniroot/list /u0/work/netbsd-current/src/distrib/common/list.sysinst |  sh -e   && touch work.built ;  }
Building tree into work
nbmtree: existing entry for `mt0', type `block' does not match type `link'
nbmtree: failed at line 237 of the specification
*** [work.built] Error code 1
1 error

nbmake: stopped in /u0/work/netbsd-current/src/distrib/miniroot
*** [all-miniroot] Error code 2
1 error

nbmake: stopped in /u0/work/netbsd-current/src/distrib

*** Failed target:  snap_post
*** Failed command: cd /u0/work/netbsd-current/src/distrib && /u0/work/netbsd-current/src/obj/tooldir.NetBSD-1.6ZG-i386/bin/nbmake depend && /u0/work/netbsd-current/src/obj/tooldir.NetBSD-1.6ZG-i386/bin/nbmake && /u0/work/netbsd-current/src/obj/tooldir.NetBSD-1.6ZG-i386/bin/nbmake release
*** Error code 2

Stop.
nbmake: stopped in /u0/work/netbsd-current/src/etc
*** [release] Error code 1
1 error

nbmake: stopped in /u0/work/netbsd-current/src

ERROR: Failed to make release
*** BUILD ABORTED ***