/var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libiberty/../include/timeval-utils.h; do \
          /usr/lib/portage/python3.8/ebuild-helpers/xattr/install -c -m 644 $h /var/tmp/portage/sys-devel/gcc-10.3.0/image${thd}; \
        done; \
fi
make[3]: Entering directory '/var/tmp/portage/sys-devel/gcc-10.3.0/work/build/libiberty/testsuite'
make[3]: Nothing to be done for 'install'.
make[3]: Leaving directory '/var/tmp/portage/sys-devel/gcc-10.3.0/work/build/libiberty/testsuite'
make[2]: Leaving directory '/var/tmp/portage/sys-devel/gcc-10.3.0/work/build/libiberty'
make[2]: Entering directory '/var/tmp/portage/sys-devel/gcc-10.3.0/work/build/libcc1'
/bin/bash ./libtool  --tag=CXX   --mode=compile x86_64-pc-linux-gnu-g++ -std=gnu++98 -DHAVE_CONFIG_H -I. -I/var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libcc1  -I /var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libcc1/../include -I /var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libcc1/../libgcc -I ../gcc -I/var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libcc1/../gcc    -W -Wall  -fvisibility=hidden  -march=skylake -fstack-protector-all -Wall -pipe -Wl,-O1 -Wl,--as-needed -O2 -MT findcomp.lo -MD -MP -MF .deps/findcomp.Tpo -c -o findcomp.lo /var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libcc1/findcomp.cc
libtool: compile:  x86_64-pc-linux-gnu-g++ -std=gnu++98 -DHAVE_CONFIG_H -I. -I/var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libcc1 -I /var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libcc1/../include -I /var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libcc1/../libgcc -I ../gcc -I/var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libcc1/../gcc -W -Wall -fvisibility=hidden -march=skylake -fstack-protector-all -Wall -pipe -Wl,-O1 -Wl,--as-needed -O2 -MT findcomp.lo -MD -MP -MF .deps/findcomp.Tpo -c /var/tmp/portage/sys-devel/gcc-10.3.0/work/gcc-10.3.0/libcc1/findcomp.cc  -fPIC -DPIC -o .libs/findcomp.o
x86_64-pc-linux-gnu-g++: /var/tmp/portage/sys-devel/gcc-10.3.0/work/build/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6: version `GLIBCXX_3.4.29' not found (required by x86_64-pc-linux-gnu-g++)
make[2]: *** [Makefile:600: findcomp.lo] Error 1
make[2]: Leaving directory '/var/tmp/portage/sys-devel/gcc-10.3.0/work/build/libcc1'
make[1]: *** [Makefile:14552: install-libcc1] Error 2
make[1]: Leaving directory '/var/tmp/portage/sys-devel/gcc-10.3.0/work/build'
make: *** [Makefile:2438: install] Error 2
 * ERROR: sys-devel/gcc-10.3.0::gentoo failed (install phase):