SDK Version 0.2.3: only head tracking

Hi All

I am not that good with C++, and run in to problems with that
I took the head tracking part, from the SDK 0.2.3 World demo and stripped until I had the head tracker to
create the pitch/roll/yaw. But the application was still in C++.
Now I moved the part that was left in to a main() application and can't get it to work any more.
I am getting segmentation fault after number 2.
Can some one help me getting this simple head tracking application to work. Without putting it in a C++ application environment, because it needs to be added to an existing application.

#include <unistd.h>
#include "OVR.h"

using namespace OVR;

int main(void)
{
	Quatf    hmdOrient;
	float    yaw = 0.0f;
	float    Pitch = 0.0f;
	float    Roll = 0.0f;
    
	Ptr<DeviceManager>  pManager;
	Ptr<SensorDevice>   pSensor;
	MessageHandler  handler;

	SensorFusion        SFusion;
	
	// *** Oculus HMD & Sensor Initialization

	// Create DeviceManager and first available HMDDevice from it.
	// Sensor object is created from the HMD, to ensure that it is on the
	 // correct device.
	printf("test1\n");
	pManager = *DeviceManager::Create();
	printf("test2\n");
	// We'll handle it's messages in this case.
	pManager->SetMessageHandler(&handler);
   
	printf("test3\n");   
	// If we didn't detect an HMD, try to create the sensor directly.
	// This is useful for debugging sensor interaction; it is not needed in
	// a shipping app.	
	pSensor = *pManager->EnumerateDevices<SensorDevice>().CreateDevice();
 	printf("test4\n");  
	if(pSensor)
	{
        // We need to attach sensor to SensorFusion object for it to receive
        // body frame messages and update orientation. SFusion.GetOrientation()
        // is used in OnIdle() to orient the view.
        SFusion.AttachToSensor(pSensor);

        SFusion.SetDelegateMessageHandler(&handler);

        SFusion.SetPredictionEnabled(true);
	}

	for ( int i = 0 ; i < 1000; i++)
	{
		hmdOrient = SFusion.GetPredictedOrientation();
		
		hmdOrient.GetEulerAngles<Axis_Y, Axis_X, Axis_Z>(&yaw, &Pitch, &Roll);
		printf("test %2.10f \n", Pitch);
		usleep(100000);
	}
	pSensor.Clear();
	return 0;
}