Cant find a OpenCV header file (CMake, OpenCV4, C++) - c++

Question

When I am creating custom libraries using OpenCV4 in the libs directory I am getting the following error:
/Documents/opencv-palisade/libs/image.cpp:2:10: fatal error: opencv2/opencv.hpp: No such file or directory
2 | #include <opencv2/opencv.hpp>
| ^~~~~~~~~~~~~~~~~~~~
Directory Structure:
.
├── build
│ ├── CMakeCache.txt
│ ├── CMakeFiles
│ ├── cmake_install.cmake
│ ├── image.jpg
│ ├── include
│ ├── libs
│ ├── Makefile
│ ├── opencv-palisade
│ ├── test.jpg
│ └── transformed_image.jpg
├── CMakeLists.txt
├── libs
│ ├── CMakeLists.txt
│ ├── image.cpp
│ └── image.hpp
└── main.cpp
5 directories, 12 files
libs/CMakeLists.txt:
project(libs)
include_directories(${OpenCV_INCLUDE_DIRS})
add_library(
image_compute
SHARED
image.hpp
image.cpp
)
root CMakeLists.txt:
cmake_minimum_required(VERSION 3.16.3)
project(opencv-palisade VERSION 1.0)
#Include header files
add_subdirectory(libs)
include_directories(libs)
# Import OpenCV library
find_package(OpenCV 4 REQUIRED)
if(OpenCV_FOUND)
message(STATUS "Found OpenCV version ${OpenCV_VERSION}")
message(STATUS "OpenCV directories: ${OpenCV_INCLUDE_DIRS}")
message(STATUS "OpenCV libraries: ${OpenCV_LIBS}")
include_directories(${OpenCV_INCLUDE_DIRS})
else()
message(FATAL_ERROR "OpenCV not found, please read the README.md")
endif(OpenCV_FOUND)
#build main.cpp
add_executable(${PROJECT_NAME} main.cpp)
target_link_directories(${PROJECT_NAME} PUBLIC libs)
target_link_libraries(${PROJECT_NAME} ${OpenCV_LIBS} image_compute)
How can I fix this issue to be able to create libraries using opencv api?