Error: "Undefined error to"

Hi,
I try to create Arduino library for UDOO but I've an issue during compilation. Indeed, I suceed to compile my program by selecting classic Arduino board like "Arduino MEGA" but when I select "UDOO Neo (Cortex M4)" in Arduino IDE, I've the following error :

Code:

C:\Users\Ivan\AppData\Local\Temp\arduino_build_724166\sketch\UDOO_test.ino.cpp.o: In function `setup':

C:\Users\Ivan\Documents\Arduino\UDOO_test/UDOO_test.ino:9: undefined reference to `OICom'

collect2.exe: error: ld returned 1 exit status

exit status 1
Erreur de compilation pour la carte UDOO Neo (Cortex M4)

I did some testing with very simple program splited into 3 files and I've the same error:
.Ino file :

Code:

#include <OICom.h>


void setup() {


OIcomLib.test();

OICom.begin();

}

void loop() {

}

.cpp file

Code:

#include "OICom.h"


void OIComLib::test()
{
 

}

.h file

Code:

// OICom.h

#ifndef _OICOM_h
#define _OICOM_h

#if defined(ARDUINO) && ARDUINO >= 100
    #include "arduino.h"
#else
    #include "WProgram.h"
#endif



class OIComLib
{

public:

    void test();


};

extern OIComLib OICom;





#endif

When I write this program in one file (in .ino file), I suceed to compile.

Thank for your help