OpenCV with CMake not working, unsure why - c++

Question

Trying to get OpenCV included in my C++ project, but having issues for some reason...
I followed the instructions to install from source:
git clone https://github.com/opencv/opencv.git
mkdir build && cd build
cmake ../opencv
make -j4
make install
I can see it in my /usr/local/include under 'opencv4'
In my CMakeLists.txt I have:
add_executable(Nssams main.cpp ${BACKWARD_ENABLE})
add_subdirectory(camera)
add_subdirectory(mqtt_client)
add_subdirectory(jsoncpp)
add_subdirectory(serial)
add_subdirectory(backward-cpp)
if(${BUILD_WITH_TESTING})
add_subdirectory(tests)
endif()
find_package(PahoMqttCpp REQUIRED)
find_package(spdlog REQUIRED)
find_package(OpenCV REQUIRED)
message(STATUS "OpenCV_INCLUDE_DIRS = ${OpenCV_INCLUDE_DIRS}")
message(STATUS "OpenCV LIBS = ${OpenCV_LIBS}")
target_link_libraries(Nssams
mqtt
camera
jsoncpp
serial
PahoMqttCpp::paho-mqttpp3-static
spdlog
${OpenCV_LIBS}
)
The messages are spitting out:
[cmake] -- OpenCV_INCLUDE_DIRS = /usr/local/include/opencv4
[cmake] -- OpenCV LIBS = opencv_calib3d;opencv_core;opencv_dnn;opencv_features2d;opencv_flann;opencv_gapi;opencv_highgui;opencv_imgcodecs;opencv_imgproc;opencv_ml;
But when I try to #include, i.e.
#include "opencv4/opencv2/core.hpp"
It's red underlined and the error says
#include errors detected based on information provided by the configurationProvider setting. Squiggles are disabled for this translation unit (/home/bwhitely/Projects/NSSAMS/nssams-cpp-ebcmos/src/camera/ebcmos.cpp).C/C++(1696)
cannot open source file "opencv2/core/cvdef.h" (dependency of "opencv4/opencv2/core.hpp")C/C++(1696)
Where am I going wrong?
I have done very similar things with the spdlog library that's in the CMakeLists.txt with no issues. Just built it from source, added it to the CMakeLists.txt and could use without issues
EDIT:
CMakeLists.txt build output while having #include "opencv4/opencv2/core/core.hpp" included in a .cpp file
[main] Building folder: nssams-cpp-ebcmos
[build] Starting build
[proc] Executing command: /usr/bin/cmake --build /home/bwhitely/Projects/NSSAMS/nssams-cpp-ebcmos/build --config Debug --target all -j 4 --
[build] Consolidate compiler generated dependencies of target backward_object
[build] Consolidate compiler generated dependencies of target camera
[build] Consolidate compiler generated dependencies of target jsoncpp
[build] Consolidate compiler generated dependencies of target mqtt
[build] [ 6%] Built target backward_object
[build] [ 12%] Building CXX object src/camera/CMakeFiles/camera.dir/ebcmos.cpp.o
[build] [ 31%] Built target mqtt
[build] [ 43%] Built target jsoncpp
[build] Consolidate compiler generated dependencies of target serial
[build] Consolidate compiler generated dependencies of target backward
[build] [ 56%] Built target backward
[build] [ 68%] Built target serial
[build] In file included from /home/bwhitely/Projects/NSSAMS/nssams-cpp-ebcmos/src/camera/ebcmos.cpp:8:
[build] /usr/local/include/opencv4/opencv2/core/core.hpp:48:10: fatal error: opencv2/core.hpp: No such file or directory
[build] 48 | #include "opencv2/core.hpp"
[build] | ^~~~~~~~~~~~~~~~~~
[build] compilation terminated.
[build] gmake[2]: *** [src/camera/CMakeFiles/camera.dir/build.make:104: src/camera/CMakeFiles/camera.dir/ebcmos.cpp.o] Error 1
[build] gmake[1]: *** [CMakeFiles/Makefile2:219: src/camera/CMakeFiles/camera.dir/all] Error 2
[build] gmake: *** [Makefile:136: all] Error 2
[proc] The command: /usr/bin/cmake --build /home/bwhitely/Projects/NSSAMS/nssams-cpp-ebcmos/build --config Debug --target all -j 4 -- exited with code: 2 and signal: null
[build] Build finished with exit code 2
It does build correctly if I do not have that include defined
output below:
[main] Building folder: nssams-cpp-ebcmos
[build] Starting build
[proc] Executing command: /usr/bin/cmake --build /home/bwhitely/Projects/NSSAMS/nssams-cpp-ebcmos/build --config Debug --target all -j 4 --
[build] [ 6%] Building CXX object src/camera/CMakeFiles/camera.dir/ebcmos.cpp.o
[build] [ 12%] Built target backward_object
[build] [ 25%] Built target jsoncpp
[build] [ 43%] Built target mqtt
[build] [ 56%] Built target serial
[build] [ 68%] Built target backward
[build] [ 75%] Linking CXX static library ../../lib/libcamera.a
[build] [ 87%] Built target camera
[build] Consolidate compiler generated dependencies of target Nssams
[build] [ 93%] Linking CXX executable ../bin/Nssams
[build] [100%] Built target Nssams
[build] Build finished with exit code 0