Probleme de linkage avec mingw

Bonjour,

J'ai un soucis de linkage mingw sous codeblocks.
Quelqu'un peut 'il m'aider ?

code :
/*
This example describes the FIRST STEPS of handling Baumer-GAPI SDK.
The given source code applies to handling one system, one camera and one image.
Please see "Baumer-GAPI SDK Programmer's Guide" chapter 4.
*/
#include <bgapi/bgapi.hpp>
#include <bgapi/bgapidef.hpp>
#include <bgapi/bgapiresult.h>
#include <stdlib.h>
#include <stdio.h>
//#include "bgapi.hpp"


#include <conio.h>


int main()
{
//DECLARATION
//===========

//Variables for first picture
int system_count=0; ;
int camera_count = 0;
BGAPI::System * pSystem = NULL;
BGAPI::Camera * pCamera = NULL;
BGAPI::Image * pImage = NULL;

BGAPI_RESULT res =BGAPI_RESULT_FAIL;
//COUNTING AVAILABLE SYSTEMS

res=BGAPI::countSystems(&system_count);
//res =system_count;
if( res != BGAPI_RESULT_OK )
{
printf("Count system object errorcode: %d system_count: %d\n", res, system_count);
return 0;
}
printf("4.1.2. Detected systems: %d\n", system_count);
}

ERREUR AFFICHER APRES COMPILATION

SDK 1.7\Components\Dev\C_C++\Lib\x86\bgapi.lib"
obj\Debug\main.o: In function 'ZN5BGAPI12countSystemsEPi':
c:/program files (x86)/codeblocks/mingw/bin/../lib/gcc/mingw32/4.7.1/../../../../include/bgapi/bgapi.hpp:120: undefined reference to '_imp__BGAPI_countSystems'
collect2.exe: error: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 0 seconds)
1 errors, 0 warnings (0 minutes, 0 seconds)