Problem using GMP with Eclipse C++ (CDT Helios)

I would like to compile my code in CDT:

#include <iostream>
#include <gmpxx.h>

using namespace std;

int main (void) {
    mpz_class a, b, c;
    a = 1234;
    b = "-5678";
    c = a+b;
    cout << "sum is " << c << "\n";
    cout << "absolute value is " << abs(c) << "\n";
    cin >> a;
    return 0;
}

When I compiled, there were some errors like this:

**** Build of configuration Debug for project test ****

**** Internal Builder is used for build               ****
g++ -LC:\Dev-Cpp\lib -lgmp -lgmpxx -otest.exe src\test.o
src\test.o(.text$_ZN10__gmp_exprIA1_12__mpz_structS1_ED1Ev[__gmp_expr<__mpz_struct [1], __mpz_struct [1]>::~__gmp_expr()]+0xd): In function `_gmpz_abs':
C:/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/gmpxx.h: undefined reference to `__gmpz_clear'
src\test.o(.text$_ZN10__gmp_exprIA1_12__mpz_structS1_EaSEPKc[__gmp_expr<__mpz_struct [1], __mpz_struct [1]>::operator=(char const*)]+0x55):C:/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/gmpxx.h: undefined reference to `__gmpz_set_str'
src\test.o(.text$_ZN10__gmp_exprIA1_12__mpz_structS1_EaSEi[__gmp_expr<__mpz_struct [1], __mpz_struct [1]>::operator=(int)]+0x14):C:/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/gmpxx.h: undefined reference to `__gmpz_set_si'
src\test.o(.text$_ZN10__gmp_exprIA1_12__mpz_structS1_EC1Ev[__gmp_expr<__mpz_struct [1], __mpz_struct [1]>::__gmp_expr()]+0xd):C:/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/gmpxx.h: undefined reference to `__gmpz_init'
src\test.o(.text$_ZlsIA1_12__mpz_structERSoS2_RK10__gmp_exprIT_S4_E[std::basic_ostream<char, std::char_traits<char> >& operator<< <__mpz_struct [1]>(std::basic_ostream<char, std::char_traits<char> >&, __gmp_expr<__mpz_struct [1], __mpz_struct [1]> const&)]+0x1c):C:/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/gmpxx.h: undefined reference to `operator<<(std::ostream&, __mpz_struct const*)'
src\test.o(.text$_ZlsIA1_12__mpz_struct16__gmp_unary_exprI10__gmp_exprIS1_S1_E18__gmp_abs_functionEERSoS7_RKS3_IT_T0_E[std::basic_ostream<char, std::char_traits<char> >& operator<< <__mpz_struct [1], __gmp_unary_expr<__gmp_expr<__mpz_struct [1], __mpz_struct [1]>, __gmp_abs_function> >(std::basic_ostream<char, std::char_traits<char> >&, __gmp_expr<__mpz_struct [1], __gmp_unary_expr<__gmp_expr<__mpz_struct [1], __mpz_struct [1]>, __gmp_abs_function> > const&)]+0x6b):C:/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/gmpxx.h: undefined reference to `operator<<(std::ostream&, __mpz_struct const*)'
src\test.o(.text$_ZrsIA1_12__mpz_structERSiS2_R10__gmp_exprIT_S4_E[std::basic_istream<char, std::char_traits<char> >& operator>><__mpz_struct [1]>(std::basic_istream<char, std::char_traits<char> >&, __gmp_expr<__mpz_struct [1], __mpz_struct [1]>&)]+0x1c):C:/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/gmpxx.h: undefined reference to `operator>>(std::istream&, __mpz_struct*)'
src\test.o(.text$_ZN10__gmp_exprIA1_12__mpz_structS1_EC1IS1_16__gmp_unary_exprIS2_18__gmp_abs_functionEEERKS_IT_T0_E[__gmp_expr<__mpz_struct [1], __mpz_struct [1]>::__gmp_expr<__mpz_struct [1], __gmp_unary_expr<__gmp_expr<__mpz_struct [1], __mpz_struct [1]>, __gmp_abs_function> >(__gmp_expr<__mpz_struct [1], __gmp_unary_expr<__gmp_expr<__mpz_struct [1], __mpz_struct [1]>, __gmp_abs_function> > const&)]+0xd):C:/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/gmpxx.h: undefined reference to `__gmpz_init'
src\test.o(.text$_ZN17__gmp_binary_plus4evalEP12__mpz_structPKS0_S3_[__gmp_binary_plus::eval(__mpz_struct*, __mpz_struct const*, __mpz_struct const*)]+0x1b):C:/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/gmpxx.h: undefined reference to `__gmpz_add'
src\test.o(.text$__gmpz_abs[___gmpz_abs]+0x1d):C:/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/gmpxx.h: undefined reference to `__gmpz_set'
collect2: ld returned 1 exit status
Build error occurred, build is stopped
Time consumed: 1514  ms.

What must I do? I've added libgmp.a and libgmpxx.a in GCC Linker but still get those problem. Thanks a lot for your answer. :)

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Problem using GMP with Eclipse C++ (CDT Helios)

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