Can't build current on old version of NetBSD

running an ancient version of NetBSD on an old i386:

NetBSD mail.wan.vpn 6.99.31 NetBSD 6.99.31 (GEMINI) #0: Sun Feb 16 19:11:21 PST 2014 root@:/usr/src/BUILD_OBJ/sys/arch/i386/compile/GEMINI i386

CVS Root says:

anoncvs%anoncvs.NetBSD.org@localhost:/cvsroot

Which I think means top of tree, yes, no, maybe?

Running these commands:

cd /usr/src && \
rm -fr BUILD_OBJ/* && \
/usr/bin/cvs update -Pd && \
export TOOLDIR=/usr/src/BUILD_TOOL && \
./build.sh -O BUILD_OBJ -T BUILD_TOOL makewrapper tools && \

Results in this:

# install /usr/src/BUILD_TOOL/lib/libnbcompat.a
/usr/src/BUILD_OBJ/tools/binstall/xinstall -d /usr/src/BUILD_TOOL/lib
/usr/src/BUILD_OBJ/tools/binstall/xinstall -c -r -m 444 libnbcompat.a /usr/src/BUILD_TOOL/lib/libnbcompat.a
# install /usr/src/BUILD_TOOL/include/compat/nbtool_config.h
/usr/src/BUILD_OBJ/tools/binstall/xinstall -c -r nbtool_config.h /usr/src/BUILD_TOOL/include/compat/nbtool_config.h
cd: can't cd to include

*** Failed target: includes
*** Failed command: (cd include && find . -name '*.h' -print | while read f ; do /usr/src/BUILD_OBJ/tools/binstall/xinstall -c -r $f /usr/src/BUILD_TOOL/include/compat/$f ; done)
*** Error code 2

Stop.
nbmake[2]: stopped in /usr/src/tools/compat

*** Failed target: install-compat
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1"; shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .) this=""; real="/usr/src/tools" ;; *) this="${dir}/"; real="/usr/src/tools/${dir}" ;; esac; show=${this:-.}; echo "${target} ===> ${show%/}${1:+ (with: $@)}"; cd "${real}" && /usr/src/BUILD_TOOL/bin/nbmake _THISDIR_="${this}" "$@" ${target}; }; _makedirtarget compat install
*** Error code 1

Stop.
nbmake[1]: stopped in /usr/src/tools

*** Failed target: build_install
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1"; shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .) this=""; real="/usr/src/tools" ;; *) this="${dir}/"; real="/usr/src/tools/${dir}" ;; esac; show=${this:-.}; echo "${target} ===> ${show%/}${1:+ (with: $@)}"; cd "${real}" && /usr/src/BUILD_TOOL/bin/nbmake _THISDIR_="${this}" "$@" ${target}; }; _makedirtarget . install-host-mkdep install-compat install-binstall
*** Error code 1

Stop.
nbmake: stopped in /usr/src/tools

ERROR: Failed to make build_install in "tools"

*** BUILD ABORTED ***

Where did I go wrong?

Thanks in advance,

Paul