lang/nodejs failed to compile

["hung.nguyengia" <hung.nguyengia%protonmail.com@localhost>]

It's based on RHEL. The GCC version is too old:

gcc version 5.5.0 20171010 (Linaro GCC 5.5-2017.10)

The distribution offers latest version of Clang and libc++, though. I bootstrapped pkgsrc like this:

./bootstrap --compiler clang --make-jobs 16 --unprivileged

It seems clang still uses gcc's libstdc++, though. It's too old and doesn't support the C++ features lang/nodejs needs so lang/nodejs still failed to compile.

Any help would be appreciated.