failed to build on Linux

[baoqger]

[ 2%] Building CXX object P0267_RefImpl/P0267_RefImpl/CMakeFiles/io2d_core.dir/rgba_color.cpp.o
In file included from /project/P0267_RefImpl/P0267_RefImpl/P0267_RefImpl/rgba_color.cpp:1:0:
/project/P0267_RefImpl/P0267_RefImpl/P0267_RefImpl/xio2d.h:18:19: fatal error: variant: No such file or directory
compilation terminated.
P0267_RefImpl/P0267_RefImpl/CMakeFiles/io2d_core.dir/build.make:62: recipe for target 'P0267_RefImpl/P0267_RefImpl/CMakeFiles/io2d_core.dir/rgba_color.cpp.o' failed
make[2]: *** [P0267_RefImpl/P0267_RefImpl/CMakeFiles/io2d_core.dir/rgba_color.cpp.o] Error 1
CMakeFiles/Makefile2:104: recipe for target 'P0267_RefImpl/P0267_RefImpl/CMakeFiles/io2d_core.dir/all' failed
make[1]: *** [P0267_RefImpl/P0267_RefImpl/CMakeFiles/io2d_core.dir/all] Error 2
Makefile:140: recipe for target 'all' failed
make: *** [all] Error 2

Failed to build in the step: cmake --build .

[gaohongfein]

the same error

[gaohongfein]

update to g+ 7.0 can solve

[karyuv]

I updaed to the latest g++ 7 and the same error occurs. what is the fix for this?