Undefined Reference error with RGBD.hpp file from opencv - c++

Question

I've got a problem at the moment...
I've got a cmake file that includes the local computer files.
cmake_minimum_required(VERSION 3.10)
project(testproject)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -pthread -Wall -fPIC -Ofast -fopenmp")
link_directories(/usr/local/lib/cmake)
set(CMAKE_BUILD_TYPE "Debug")
find_package(OpenCV REQUIRED)
set(LIBRARY_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/Libraries/include)
set(LIBRARY_USR_INCLUDE_DIR /usr/local/include)
add_executable(testproject
"base.cpp"
"Libraries/include/base64/base64.h"
"Libraries/include/base64/base64.cpp"
)
target_include_directories(${CMAKE_PROJECT_NAME} PUBLIC ${LIBRARY_USR_INCLUDE_DIR} ${OpenCV_INCLUDE_DIRS} ${LIBRARIES} ${LIBRARY_INCLUDE_DIR})
target_link_libraries(${CMAKE_PROJECT_NAME} "${OpenCV_LIBS}" stdc++fs)
The include file within CMAKE works because there are other files with opencv included and those are found..
Only the weird problem is that the rgbd.hpp (File is under /usr/local/include/) is found and also the function but when i'm making the the file with.
Terminal Process:
make -j7
ERROR RESULT:
[ 15%] Linking CXX executable count
CMakeFiles/count.dir/base.cpp.o: In function `main':
/home/testpc/Documents/Test/base.cpp:10: undefined reference to `cv::rgbd::DepthCleaner::DepthCleaner(int, int, int)'
collect2: error: ld returned 1 exit status
CMakeFiles/count.dir/build.make:374: recipe for target 'count' failed
make[2]: *** [count] Error 1
CMakeFiles/Makefile2:94: recipe for target 'CMakeFiles/count.dir/all' failed
make[1]: *** [CMakeFiles/count.dir/all] Error 2
Makefile:102: recipe for target 'all' failed
make: *** [all] Error 2
That this happens when all the other files are already have been compiled.
Problem class: Base.cpp
#include "opencv2/rgbd.hpp"
int main()
{
rgbd::DepthCleaner * depthc = new rgbd::DepthCleaner(CV_16U, 7, rgbd::DepthCleaner::DEPTH_CLEANER_NIL);
}
Possible Tried Solutions:
Still having the same result, When i remove the content within the main method and replace it with cout << "Test" << endl; It builds and runs as it suppose to be. Also works when I create a new raw Material blanko with standard Opencv core included.
It only does not build with the RGBD Include and instance creation.
(RGDB.hpp does not stand under /usr/local/inlclude) but under /usr/include. So i removed the local part but still responded as the same current issue. Any other possible solution?