[Ask for Help] simple_camera.cpp:10:10: fatal error: opencv2/opencv.hpp: No such file or directory

[zinwalin]

Describe the issue
jetson@nano:~/CSI-Camera$ g++ -std=c++11 -Wall -I/usr/lib/opencv simple_camera.cpp -L/usr/lib -lopencv_core -lopencv_highgui -lopencv_videoio -o simple_camera
simple_camera.cpp:10:10: fatal error: opencv2/opencv.hpp: No such file or directory
#include <opencv2/opencv.hpp>
^~~~~~~~~~~~~~~~~~~~
compilation terminated.

What version of L4T/JetPack
L4T/JetPack version:
jetson@nano:~/CSI-Camera$ jetson_release

• NVIDIA Jetson Nano (Developer Kit Version)
  • Jetpack 4.5.1 [L4T 32.5.1]
  • NV Power Mode: MAXN - Type: 0
  • jetson_stats.service: active
• Libraries:
  • CUDA: 10.2.89
  • cuDNN: 8.0.0.180
  • TensorRT: 7.1.3.0
  • Visionworks: 1.6.0.501
  • OpenCV: 4.1.1 compiled CUDA: NO
  • VPI: ii libnvvpi1 1.0.15 arm64 NVIDIA Vision Programming Interface library
  • Vulkan: 1.2.70

What version of OpenCV
OpenCV version:
jetson@nano:~/CSI-Camera$ python
Python 2.7.17 (default, Sep 30 2020, 13:38:04)
[GCC 7.5.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.

import cv2
cv2.version
'4.1.1'

Python Version
Python version if applicable:
jetson@nano:/CSI-Camera$ python3 --version
Python 3.6.9
jetson@nano:/CSI-Camera$ python --version
Python 2.7.17

To Reproduce
Steps to reproduce the behavior:
For example, what command line did you run?

Expected behavior
A clear and concise description of what you expected to happen.

Additional context
Add any other context about the problem here.

[RobotianViking]

Location of included OpenCV include files are placed in /usr/include/opencv4
Compiled it succesfully with
g++ -std=c++11 -Wall -I/usr/include/opencv4 simple_camera.cpp -L/usr/lib -lopencv_core -lopencv_highgui -lopencv_videoio -o simple_camera