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I try to split .avi video into frame of images using this code :

#include <stdio.h>
#include < string.h>
#include <stdlib.h>
#include "cv.h"
#include <highgui.h>
#include "cxcore.h" 
int main( int argc, char** argv )
{    

    CvCapture *capture = cvCaptureFromAVI("xyz.avi");
    if(!capture) 
    {
        printf("!!! cvCaptureFromAVI failed (file not found?)\n");
        return -1; 
    }

    int fps = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
    printf("* FPS: %d\n", fps);

    IplImage* frame = NULL;
    int frame_number = 0;
    char key = 0;   

    while (key != 'q') 
    {
        // get frame 
        frame = cvQueryFrame(capture);       
        if (!frame) 
        {
            printf("!!! cvQueryFrame failed: no frame\n");
            break;
        }       

        char filename[100];
        strcpy(filename, "frameSplit");

        char frame_id[30];
        itoa(frame_number, frame_id, 10);
        strcat(filename, frame_id);
        strcat(filename, ".png");

        printf("* Saving: %s\n", filename);

        if (!cvSaveImage(filename, frame,0))
        {
            printf("!!! cvSaveImage failed\n");
            break;
        }

        frame_number++;

        // quit when user press 'q'
        key = cvWaitKey(1000 / fps);
    }

    // free resources
    cvReleaseCapture(&capture);

    return 0;
}

when i try to compile this program using : g++ -O2 -Wall -o VideoToImages VideoToImages.cpp pkg-config --cflags --libs opencv

i got this error : fatal error: string.h:no such file or directory compilation terminated

Any idea please Thanks