Problem with including RStringView.h file

I am trying to compile code with g++-y compiler. But I have this error:

[ICU]:Selector> /usr/bin/g++-7 -std=c++17 SelectorTest.C 
In file included from /usr/local/include/root/TNamed.h:29:0,
                 from /usr/local/include/root/TDictionary.h:45,
                 from /usr/local/include/root/TInterpreter.h:26,
                 from Selector.h:8,
                 from PrimarySelector.h:5,
                 from SelectorTest.C:1:
/usr/local/include/root/TString.h:41:10: fatal error: RStringView.h: No such file or directory
 #include <RStringView.h>
          ^~~~~~~~~~~~~~~
compilation terminated.

What’s wrong and how to fix?

I am using

 ------------------------------------------------------------
 | Welcome to ROOT 6.08/02                http://root.cern.ch |
 |                               (c) 1995-2016, The ROOT Team |
 | Built for linuxx8664gcc                                    |
 | From tag v6-08-02, 2 December 2016                         |
 | Try '.help', '.demo', '.license', '.credits', '.quit'/'.q' |
  ------------------------------------------------------------

Thanks in advance.

It seems this was already discussed here:

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