On a system running:

NetBSD toy.wan.vpn 8.99.26 NetBSD 8.99.26 (GEMINI) #0: Sun Nov 25 11:06:09
PST 2018  r...@toy.wan.vpn:/usr/src/BUILD_OBJ/sys/arch/i386/compile/GEMINI
i386

/etc/mk.conf specifies:
X11_TYPE=modular

I built gcc8 and it resides in:

: which cc
/usr/pkg/gcc8/bin/cc

I attempt to build NetBSD 9.0:

Immediately before attempting to compile a  "cvs update -Pd" of the source
is at location:

/home/downloads/NetBSD-9.0_src/src
/home/downloads/NetBSD-9.0_src/xsrc

: cat CVS/Tag
Tnetbsd-9

: env
HOST_CXX=/usr/pkg/gcc8/bin/g++
HOST_SH=/bin/sh
SUDO_GID=20
DISPLAY=localhost:12.0
OLDPWD=/usr/pkgsrc
USERNAME=root
SUDO_COMMAND=/bin/bash
SOURCE=/home/downloads/NetBSD-9.0_src/
USER=root
HOST_CC=/usr/pkg/gcc8/bin/cc
PWD=/home/downloads/NetBSD-9.0_src/src
HOME=/root
SUDO_USER=newhouse
SUDO_UID=7769
MAIL=/var/mail/root
SHELL=/bin/sh
TERM=xterm
SHLVL=1
LOGNAME=root
PATH=/usr/pkg/gcc8:/usr/pkg/gcc8/bin:/usr/bin:/bin:/usr/pkg/bin:/usr/pkg/sbin:/usr/local/bin:/usr/X11R7/bin:/usr/sbin:/sbin:.
PS1=toy[root]:
_=/usr/bin/env

Building with this command:

./build.sh -O ./BUILD_OBJ -T ./BUILD_TOOL -R $SOURCE/src/xreleasedir -X
$SOURCE/../xsrc  makewrapper tools

I get this with completel baffles me.

checking for /usr/pkg/gcc8/bin/cc option to accept ANSI C... none needed
checking whether we are using the GNU C++ compiler... yes
checking whether /usr/pkg/gcc8/bin/g++ accepts -g... yes
checking that C++ compiler can compile simple program... yes
checking that C++ static constructors and destructors are called... no
configure: error: a working C++ compiler is required

*** Failed target:  .configure_done
*** Failed command: (cd build && AR=ar
AWK=/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL/bin/nbawk
CC=/usr/pkg/gcc8/bin/cc CFLAGS=-O CONFIG_SHELL=/bin/sh CPPFLAGS=\
-I/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL/include/compat\
-I/home/downloads/NetBSD-9.0_src/src/tools/compat\ \
-DHAVE_NBTOOL_CONFIG_H=1\ -D_FILE_OFFSET_BITS=64 CXX=/usr/pkg/gcc8/bin/g++
CXXFLAGS=-O
INSTALL=/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL/bin/i486--netbsdelf-install\
-c\ \ -r LDFLAGS=
LEX=/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL/bin/nblex
FLEX=/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL/bin/nblex
M4=/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL/bin/nbm4
MAKE=/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL/bin/nbmake
PATH="/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL/bin:$PATH"
RANLIB=ranlib
YACC=/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL/bin/nbyacc /bin/sh
/home/downloads/NetBSD-9.0_src/src/tools/groff/../../external/gpl2/groff/dist/configure
--without-x --prefix=/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL)
*** Error code 1

Stop.
nbmake[3]: stopped in /home/downloads/NetBSD-9.0_src/src/tools/groff

*** Failed target:  dependall
*** Failed command: cd "/home/downloads/NetBSD-9.0_src/src/tools/groff";
/home/downloads/NetBSD-9.0_src/src/./BUILD_TOOL/bin/nbmake realall
*** Error code 1

The .../tools/groff  directory contains only the files CVS and Makefile.
cvs update -Pd doesn't add any files.

Where did I go wrong?
Hints and/or clues are appreciated,

TIA,
Paul N.

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