"g++-6"   -fvisibility-inlines-hidden -std=c++11 -fPIC -m64 -pthread -O0 -fno-inline -Wall -fvisibility=hidden  -DBOOST_ALL_NO_LIB=1 -DBOOST_CHARCONV_DYN_LINK=1 -DBOOST_CHARCONV_NO_LIB=1 -DBOOST_COBALT_USE_STD_PMR=1   -I".." -I"/var/boost/run/boost_root/libs/assert/include" -I"/var/boost/run/boost_root/libs/charconv/include" -I"/var/boost/run/boost_root/libs/core/include" -I"/var/boost/run/boost_root/libs/throw_exception/include"  -c -o "/var/boost/run/results/boost/bin.v2/libs/parser/test/class_type.test/gcc-6~c++11/debug/x86_64/debug-symbols-off/threading-multi/visibility-hidden/class_type.o" "../libs/parser/test/class_type.cpp"

In file included from ../boost/parser/detail/text/transcode_algorithm.hpp:11:0,
                 from ../boost/parser/detail/text/transcode_view.hpp:9,
                 from ../boost/parser/error_handling_fwd.hpp:6,
                 from ../boost/parser/parser_fwd.hpp:10,
                 from ../boost/parser/parser.hpp:9,
                 from ../libs/parser/test/class_type.cpp:9:
../boost/parser/detail/text/transcode_iterator.hpp:21:23: fatal error: string_view: No such file or directory
 #include <string_view>
                       ^
compilation terminated.