Why do not ubuntu16.04 on TX2 support C++11?

I want to generate cmake using source code on ubuntu16.04 based on TX2, but when I run ./bootstrap, the cmake can not be generated and the system give out “The C++ compiler does not support c++11(e.g. std::unique_ptr” message. My GCC version is 5.4.0 20160609(Ubuntu/linaro 5.4.0-6ubuntu1~16.04.9), does not it suppport c++11?

Sort of a duplicate thread…see this: