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qtwebengine5.9.5のbuildに失敗する

Ubuntu16.04 amd64上で、qtwebengine5.9の構築途中で以下のエラーが発生します。
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[7831/17407] CXX v8_snapshot/obj/third_party/icu/bundled_icui18n/affixpatternparser.o
FAILED: v8_snapshot/obj/third_party/icu/bundled_icui18n/affixpatternparser.o
/home/lineo/dey-2.4R1.2/tmp/hosttools/g++ -MMD -MF v8_snapshot/obj/third_party/icu/bundled_icui18n/affixpatternparser.o.d -DU_I18N_IMPLEMENTATION -DV8_DEPRECATION_WARNINGS -DUSE_UDEV -DUSE_AURA=1 -DUSE_NSS_CERTS=1 -DUSE_OZONE=1 -DNO_TCMALLOC -DDISABLE_NACL -DENABLE_TASK_MANAGER=1 -DENABLE_THEMES=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -DFIELDTRIAL_TESTING_ENABLED -DTOOLKIT_QT -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DHAVE_DLOPEN=0 -DUCONFIG_ONLY_HTML_CONVERSION=1 -DU_CHARSET_IS_UTF8=1 -DU_USING_ICU_NAMESPACE=0 -DU_ENABLE_DYLOAD=0 -DU_STATIC_IMPLEMENTATION -DICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE -Iv8_snapshot/gen -I../../../../git/src/3rdparty/chromium -I../../../../git/src/3rdparty/chromium/third_party/icu/source/common -I../../../../git/src/3rdparty/chromium/third_party/icu/source/i18n -Wno-deprecated-declarations -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -pipe -pthread -m32 -msse2 -mfpmath=sse -mmmx -Os -fno-ident -fdata-sections -ffunction-sections -g0 -fvisibility=hidden -Wno-unused-local-typedefs -Wno-maybe-uninitialized -Wno-missing-field-initializers -Wno-unused-parameter -Wno-unused-function -fno-threadsafe-statics -fvisibility-inlines-hidden -std=gnu++11 -fno-delete-null-pointer-checks -fno-exceptions -frtti -Wno-deprecated -Wno-narrowing -c ../../../../git/src/3rdparty/chromium/third_party/icu/source/i18n/affixpatternparser.cpp -o v8_snapshot/obj/third_party/icu/bundled_icui18n/affixpatternparser.o
In file included from ../../../../git/src/3rdparty/chromium/third_party/icu/source/common/unicode/std_string.h:35:0,
from ../../../../git/src/3rdparty/chromium/third_party/icu/source/common/unicode/unistr.h:33,
from ../../../../git/src/3rdparty/chromium/third_party/icu/source/common/unicode/locid.h:36,
from ../../../../git/src/3rdparty/chromium/third_party/icu/source/i18n/unicode/dcfmtsym.h:36,
from ../../../../git/src/3rdparty/chromium/third_party/icu/source/i18n/affixpatternparser.cpp:14:
/usr/include/c++/5/string:38:28: fatal error: bits/c++config.h: No such file or directory
compilation terminated.
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ボードベンダーから提供されているBSPの手順書では、g++multilib の追加インストールが記載されていますが、
https://www.digi.com/resources/documentation/digidocs/90002284/#task/ecl...
meta-qt5のREADMEには未記載です。

従来のバージョンのBSPでは不要でしたが、qtwebengineのバージョンが上がり、chromiumから持ち込まれたソースコードが
g++multilib のインストールを必要としているようです。