리눅스에서 처음 gcc로 c++프로그램짭니다.

간단하게
#include <iostream>
#include <cstring>

using namespace std;
int main() {
cout << "hello!" << endl;
return 0;
}

이런코드를 적어보앗는데
에라메시지가 뜹니다. 저로선 모르겟다는;

[root@dor225140 c++]# gcc test.cpp
/tmp/ccldjPFi.o(.text+0xd): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() const'
/tmp/ccldjPFi.o(.text+0x60): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned int) const'
/tmp/ccldjPFi.o(.text+0x9d): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned int) const'
/tmp/ccldjPFi.o(.text+0xc8): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned int) const'
/tmp/ccldjPFi.o(.text+0x11c): In function `main':
: 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> >&)'
/tmp/ccldjPFi.o(.text+0x129): In function `main':
: undefined reference to `std::cout'
/tmp/ccldjPFi.o(.text+0x12e): In function `main':
: 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*)'
/tmp/ccldjPFi.o(.text+0x137): In function `main':
: 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/ccldjPFi.o(.text+0x164): In function `__static_initialization_and_destruction_0(int, int)':
: undefined reference to `std::ios_base::Init::Init()'
/tmp/ccldjPFi.o(.text+0x193): In function `__tcf_0':
: undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccldjPFi.o(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

검색해도 못찾겟다는; 다들 이런일없엇나요?

ps. 그리고 리눅스처음깔아ㅤㅂㅘㅅ는데요...
[root@dor225140 c++]
여기서 dor225140 은 뭔가요??? 무슨뜻이죠?