Hi, I have to use clang++-13 and libc++ due to GCC 9.3 or newer is required to build WebKit. So I just add USE_LIBCXX option to use llvm libc++: https://github.com/xiangzhai/WebKit/commit/43846a584ac3f91d49ed3420c8021479a0effdaa Thanks, Leslie Zhai
Pull request: https://github.com/WebKit/WebKit/pull/3904