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6.18. libstc++ preview

The libstdc++so7 package has been added. This package contains a preview of the GNU Standard C++ Library from libstdcxx_so_7-branch. It is considered experimental and unsupported. Do not build any production software against it, as its ABI and so-version will change in future upgrades. To build software using this library, invoke g++-libstdc++so_7 instead of g++.