Mine

Free space in last tar block: boot 44, netbsd 256,
buildfloppies.sh: Image is 22272 bytes (21 KB) too big to fit on 1 disk

*** Failed target:  boot-big1.fs
*** Failed command: PAX=/home/builds/netbsd-4/tools-i386/bin/nbpax /bin/sh /home/builds/netbsd-4/distrib/common/buildfloppies.sh -i "/home/builds/netbsd-4/tools-i386/bin/nbinstallboot -mi386 @IMAGE@ /home/builds/netbsd-4/dist-i386/usr/mdec/bootxx_ustarfs" -p -m 1 -s .fs boot-big 5760 boot USTAR.volsize.13200 netbsd
*** Error code 1

Stop.
nbmake: stopped in /home/builds/netbsd-4/distrib/i386/floppies/bootfloppy-big

*** Failed target:  all-bootfloppy-big
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1"; shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .) this="etc/i386/floppies/"; real="/home/builds/netbsd-4/distrib/i386/floppies" ;; *) this="etc/i386/floppies/${dir}/"; real="/home/builds/netbsd-4/distrib/i386/floppies/${dir}" ;; esac; show=${this:-.}; echo "${target} ===> ${show%/}${1:+ (with: $@)}"; cd "${real}" && /home/builds/netbsd-4/tools-i386/bin/nbmake _THISDIR_="${this}" "$@" ${target}; }; _makedirtarget bootfloppy-big all
*** Error code 1

Stop.
nbmake: stopped in /home/builds/netbsd-4/distrib/i386/floppies