1. Refer to installation or compile OPENCV
https://aipro.blog.csdn.net/article/details/112538453
2, configure codelite

I:\opencv\opencv\build\include
I:\opencv\opencv\build\include\opencv2\highgui

#include <iostream>
#include "highgui.hpp"
using namespace std;
int main(int argc, char **argv)
{
    
	IplImage* img=cvLoadImage("i:\\pro\\1.png");
    cvNamedWindow("show",CV_WINDOW_AUTOSIZE);
    cvShowImage("show",img);
    cvWaitKey(0);
    cvReleaseImage(&img);
    cvDestroyWindow("show");
	return 0;
}