Build problem with NetBSD 9_Stable amd64 (tools/nbmakestrs?)

[yancm%sdf.org@localhost]

Since about last Friday (Dec.11) I am encountering an error building the
distribution for amd64 NetBSD 9_Stable branch from latest sources.

Tracking stable branch via:
cvs -q up -rnetbsd-9 -PAd src

Building tools itself with:
./build.sh -O ../obj -T ../tools -u tools
completes without error, which seems confusing...

I had previously built successfully, first had the error when trying to
update sources, then started with clean tools and obj directory, but have
same error.

Using build.sh with command:
./build.sh -x -O ../obj -T ../tools -u distribution

[stuff that seems normal deleted]
#    create  makestrs/.depend
rm -f .depend
/usr/src/../tools/bin/nbhost-mkdep -s .lo\ .ln\ .d -d -f .depend makestrs.d
/usr/src/../tools/bin/nbhost-mkdep: Ignoring makestrs.d
#      link  makestrs/nbmakestrs
cc -O -I/usr/src/../tools/include/compat -I/usr/src/tools/compat
-DHAVE_NBTOOL_CONFIG_H=1 -D_FILE_OFFSET_BITS=64 -I.   -o nbmakestrs
makestrs.lo -L/usr/src/../tools/lib -lnbcompat -lrt -lz
cc: error: makestrs.lo: No such file or directory

*** Failed target:  nbmakestrs
*** Failed command: cc -O -I/usr/src/../tools/include/compat
-I/usr/src/tools/compat -DHAVE_NBTOOL_CONFIG_H=1 -D_FILE_OFFSET_BITS=64
-I. -o nbmakestrs makestrs.lo -L/usr/src/../tools/lib -lnbcompat -lrt -lz
*** Error code 1

Stop.
nbmake[6]: stopped in /usr/src/tools/makestrs

*** Failed target:  dependall
*** Failed command: cd "/usr/src/tools/makestrs";
/usr/src/../tools/bin/nbmake realall
*** Error code 1

Stop.
nbmake[5]: stopped in /usr/src/tools/makestrs

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

Stop.
nbmake[4]: 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="tools/"; real="/usr/src/tools" ;; *) this="tools/${dir}/";
real="/usr/src/tools/${dir}" ;; esac; show=${this:-.}; echo "${target}
===> ${show%/}${1:+ (with: $@)}"; cd "${real}" &&
/usr/src/../tools/bin/nbmake _THISDIR_="${this}" "$@" ${target}; };
_makedirtarget . dependall-llvm-tblgen dependall-groff dependall-mandoc
dependall-makestrs dependall-makekeys dependall-cvslatest
*** Error code 1

Stop.
nbmake[3]: stopped in /usr/src/tools

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

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

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

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

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

Stop.
nbmake: stopped in /usr/src

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