OpenKinect c++ - Freenect::Freenect freenect - c++

Question

I have a problem with the code OpenKinect provides. I'm trying to use the Kinect with c++, but I get this error. On the web this question was already asked, but I have not find a decent answer. The code is this:
#include <cstdlib>
#include "libfreenect.h"
#include "libfreenect.hpp"
#include <pthread.h>
#include <stdio.h>
#include <iostream>
#include <string.h>
#include <cmath>
#include <vector>
#if defined(__APPLE__)
#include <GLUT/glut.h>
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#else
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
#endif
using namespace std;
class Mutex {
...
};
class MyFreenectDevice : public Freenect::FreenectDevice {
public:
MyFreenectDevice(freenect_context *_ctx, int _index)
: Freenect::FreenectDevice(_ctx, _index),
m_buffer_depth(freenect_find_video_mode(FREENECT_RESOLUTION_MEDIUM, FREENECT_VIDEO_RGB).bytes),
m_buffer_video(freenect_find_video_mode(FREENECT_RESOLUTION_MEDIUM, FREENECT_VIDEO_RGB).bytes),
m_gamma(2048),
m_new_rgb_frame(false),
m_new_depth_frame(false)
{
for (unsigned int i = 0; i < 2048; i++) {
float v = i / 2048.0;
v = std::pow(v, 3) * 6;
m_gamma[i] = v * 6 * 256;
}
}
...
private:
std::vector<uint8_t> m_buffer_depth;
std::vector<uint8_t> m_buffer_video;
std::vector<uint16_t> m_gamma;
Mutex m_rgb_mutex;
Mutex m_depth_mutex;
bool m_new_rgb_frame;
bool m_new_depth_frame;
};
Freenect::Freenect freenect;
MyFreenectDevice* device;
freenect_video_format requested_format(FREENECT_VIDEO_RGB);
...
I get the error Unable to resolve identifier identifier freenect for the instruction Freenect::Freenect freenect;.
The code of this template is in the libfreenect.hpp code:
class Freenect : Noncopyable {
private:
typedef std::map<int, FreenectDevice*> DeviceMap;
public:
...
template <typename ConcreteDevice>
ConcreteDevice& createDevice(int _index) {
DeviceMap::iterator it = m_devices.find(_index);
if (it != m_devices.end()) delete it->second;
ConcreteDevice * device = new ConcreteDevice(m_ctx, _index);
m_devices.insert(std::make_pair<int, FreenectDevice*>(_index, device));
return *device;
}
...
}
I have no idea of what is the problem, this is the official code and it should work.. any suggestions? thanks in advance