Not compiling against glslang

[oneforall2]

FAILED: src/libplacebo.so.264.p/glsl_glslang.cc.o. ccache c++ -Isrc/libplacebo.so.264.p -Isrc -I../src -Isrc/include -I../src/include -Isrc/opengl/include. -I../src/opengl/include -Isrc/vulkan -Isrc/opengl/include/glad -I/usr/include/glslang -fvisibility=hidden. -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wextra -std=c++11 -O3 -O2 -m64 -fPIC. -fPIC -pthread -MD -MQ src/libplacebo.so.264.p/glsl_glslang.cc.o -MF src/libplacebo.so.264.p/glsl_glslang.cc .o.d -o src/libplacebo.so.264.p/glsl_glslang.cc.o -c ../src/glsl/glslang.cc In file included from /usr/include/glslang/Include/Types.h:47, from /usr/include/glslang/Include/intermediate.h:57, from /usr/include/glslang/MachineIndependent/localintermediate.h:42, from /usr/include/glslang/SPIRV/SpvTools.h:50, from /usr/include/glslang/SPIRV/GlslangToSpv.h:42, from ../src/glsl/glslang.cc:28: /usr/include/glslang/Include/SpirvIntrinsics.h:120:10: error: ‘variant’ in namespace ‘std’ does not name a. template type 120 | std::variant<const TIntermConstantUnion*, const TType*> value;

[oneforall2]

hmm I added CXXFLAGS=-std="c++17" and it compiles..