[완료]c++독학하고 있는데요... 코딩해보다가 궁금한게 생겼어요

#include<iostream>
using std::cout;
using std::cin;
using std::endl;
 
typedef struct __Point
{
	int xpos;
	int ypos;
} Point;
Point& PntAdder(const Point &p1, const Point &p2)
{
	Point* pnt = new Point;
	pnt->xpos = p1.xpos + p2.xpos;
	pnt->ypos = p1.ypos + p2.ypos;
 
	return *pnt;
}
 
int main(void)
{
	Point* Rpnt = new Point;
	Rpnt->xpos = 10;
	Rpnt->ypos = 20;
 
	Point* Lpnt = new Point;
	Lpnt->xpos = 20;
	Lpnt->ypos = 40;
 
	Point &ref = PntAdder(*Rpnt, *Lpnt);
	cout << ref.xpos << "," << ref.ypos << endl;
	return 0;
}

/tmp/ccewztRC.o: In function `PntAdder(__Point const&, __Point const&)':
02-3.cpp:(.text+0xe): undefined reference to `operator new(unsigned int)'
/tmp/ccewztRC.o: In function `main':
02-3.cpp:(.text+0x51): undefined reference to `operator new(unsigned int)'
02-3.cpp:(.text+0x76): undefined reference to `operator new(unsigned int)'
02-3.cpp:(.text+0xbf): undefined reference to `std::cout'
02-3.cpp:(.text+0xc4): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(int)'
02-3.cpp:(.text+0xd4): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
02-3.cpp:(.text+0xe0): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(int)'
02-3.cpp:(.text+0xe8): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
02-3.cpp:(.text+0xf0): undefined reference to `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> >&))'
/tmp/ccewztRC.o: In function `__static_initialization_and_destruction_0(int, int)':
02-3.cpp:(.text+0x11b): undefined reference to `std::ios_base::Init::Init()'
02-3.cpp:(.text+0x120): undefined reference to `std::ios_base::Init::~Init()'
collect2: ld returned 1 exit status