xz -current build failure

[bch <brad.harder%gmail.com@localhost>]

includes ===> lib/../external/mit/expat/lib/libexpat
includes ===> lib/../external/public-domain/sqlite/lib
includes ===> lib/../external/public-domain/xz/lib
#    create  lib/pub-lzma.h
rm -f pub-lzma.h
/usr/src/obj/tooldir.NetBSD-7.99.9-amd64/bin/nbcat
/usr/src/external/public-domain/xz/lib/../dist/src/liblzma/api/lzma.h
> pub-lzma.h
nbmake[4]: don't know how to make lzma.h. Stop

nbmake[4]: stopped in /usr/src/external/public-domain/xz/lib

*** Failed target:  includes-../external/public-domain/xz/lib
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1";
shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .)
this="lib/"; real="/usr/src/lib" ;; *) this="lib/${dir}/";
real="/usr/src/lib/${dir}" ;; esac; show=${this:-.}; echo "${target}
===> ${show%/}${1:+ (with: $@)}"; cd "${real}" &&
/usr/src/obj/tooldir.NetBSD-7.99.9-amd64/bin/nbmake
_THISDIR_="${this}" "$@" ${target}; }; _makedirtarget
../external/public-domain/xz/lib includes
*** Error code 2

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

*** Failed target:  includes-lib
*** 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/obj/tooldir.NetBSD-7.99.9-amd64/bin/nbmake
_THISDIR_="${this}" "$@" ${target}; }; _makedirtarget lib includes
*** Error code 1