libDUO.so undefined reference to GLIBCXX_3.4.21

[sjyeh]

I am trying to compile the C++ samples using Ubuntu 14.04 but receiving the following error message: samples/SDK/linux/x64/libDUO.so: undefined reference to 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_create(unsigned long&, unsigned long)@GLIBCXX_3.4.21'

Any idea? Thanks.