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I write code like this in my Mac OS X v10.8 (Mountain Lion), and when I use "gcc use_new.cpp -o use_new" to compile it, it throws a wrong message like this: Undefined symbols for architecture x86_64: "std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))", referenced from: _main in ccr2vrRQ.o "std::basic_ostream<char, std::char_traits<char> >::operator<<(void const*)", referenced from: _main in ccr2vrRQ.o "std::basic_ostream<char, std::char_traits<char> >::operator<<(double)", referenced from: _main in ccr2vrRQ.o "std::basic_ostream<char, std::char_traits<char> >::operator<<(int)", referenced from: _main in ccr2vrRQ.o "std::basic_ostream<char, std::char_traits<char> >::operator<<(unsigned long)", referenced from: _main in ccr2vrRQ.o "std::ios_base::Init::Init()", referenced from: __static_initialization_and_destruction_0(int, int) in ccr2vrRQ.o "std::ios_base::Init::~Init()", referenced from: __static_initialization_and_destruction_0(int, int) in ccr2vrRQ.o "std::cout", referenced from: _main in ccr2vrRQ.o "std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)", referenced from: _main in ccr2vrRQ.o "std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&,

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