make

Using /usr/bin/llvm-config [version=5.0.0]
g++ -c  -o src/llvm/ext/llvm_ext.o src/llvm/ext/llvm_ext.cc `/usr/bin/llvm-config --cxxflags`
g++: error: unrecognized command line option ‘-Wcovered-switch-default’; did you mean ‘-Wno-switch-default’?
g++: error: unrecognized command line option ‘-Wstring-conversion’; did you mean ‘-Wint-conversion’?
make: *** [Makefile:121: src/llvm/ext/llvm_ext.o] Error 1