Problem with including RStringView.h file

[couet]

It seems this was already discussed here:

String_view problem

Dear expert: when I compile a simple c++ code I found follow error: RStringView.h:19:23: error：string_view：No such file or directory. gcc version is 6.02 Macbook: 10.12 root version: root_v6.10.08 could anyone help on fix this. thanks