Include < experimental/filesystem >

Hi,

what do I have to do to be able to include the < experimental/filesystem > library in one of my root macros?
http://en.cppreference.com/w/cpp/header/experimental/filesystem

The file system library comes with c++17:
http://en.cppreference.com/w/cpp/experimental/fs

There is a CMake flag to enable C++17 support (this needs to be done when building root):

option name default value description

cxx17 OFF Build using C++17 compatible mode, requires gcc > 7.1.x or clang

https://root.cern.ch/building-root

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