Step 0: check gcc and g++ clang might cause compilation error. % g++ -v Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/usr/local/Cellar/gcc/9.2.0_3/libexec/gcc/x86_64-apple-darwin19/9.2.0/lto-wrapper Target: x86_64-apple-darwin…