checking whether g++ supports C++14 features with -std=c++14... no
checking whether g++ supports C++14 features with +std=c++14... no
checking whether g++ supports C++14 features with -h std=c++14... no
checking whether g++ supports C++14 features with -std=c++1y... no
checking whether g++ supports C++14 features with +std=c++1y... no
checking whether g++ supports C++14 features with -h std=c++1y... no
configure: error: *** A compiler with support for C++14 language features is required.