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This software can use system gcc. On test nodes we observed successful builds when system gcc is 8.3.0 and failures with system gcc is 6.3.0:

checking whether g++ supports C++17 features with -std=c++17... no
checking whether g++ supports C++17 features with +std=c++17... no
checking whether g++ supports C++17 features with -h std=c++17... no
checking whether g++ supports C++17 features with -std=c++1z... no
checking whether g++ supports C++17 features with +std=c++1z... no
checking whether g++ supports C++17 features with -h std=c++1z... no
configure: error: *** A compiler with support for C++17 language features is required.
...
While:
  Installing powerdns.