src/serialization/string_utils.cpp:1068:28: error: use of undeclared identifier 'ucs4'
   if(uchar <= static_cast<ucs4::char_t>(std::numeric_limits<wchar_t>::max()) )
                           ^
src/serialization/string_utils.cpp:1068:13: error: comparison of integers of different signs: 'ucs4char' (aka 'unsigned int') and 'wchar_t' [-Werror,-Wsign-compare]
   if(uchar <= static_cast<ucs4::char_t>(std::numeric_limits<wchar_t>::max()) )
      ~~~~~ ^                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 errors generated.
/usr/bin/ccache clang++ -o build/release/tests/main.o -c -std=c++98 -pipe -march=native -pthread -W -Wall -Werror -Wno-unused-local-typedefs -Qunused-arguments -Wno-unknown-warning-option -O2 -O3 -D_GNU_SOURCE=1 -D_REENTRANT -DHAVE_LIBDBUS -DHAVE_CONFIG_H -D_X11 -DBOOST_TEST_DYN_LINK -Ibuild -Isrc -I/usr/include -I/usr/include/SDL -I/usr/include/pango-1.0 -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libdrm -I/usr/include/libpng12 -I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -I/usr/include/fribidi src/tests/main.cpp
scons: *** [build/release/serialization/string_utils.o] Error 1
scons: building terminated because of errors.