wangxiaoxiaodeMacBook-Air:cpp wangxiaoxiao$ g++ facedetect.cpp -o facedetect `pkg-config-cflags --libs opencv`
-bash: pkg-config-cflags: command not found
facedetect.cpp:1:10: fatal error: 'opencv2/opencv.hpp' file not found
#include "opencv2/opencv.hpp"
^
1 error generated.
使用pkg-config-cflags编译但是找不到头文件是怎么回事呢?