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Errors when trying to make Samples

Attempting to install OpenCV 3.4.3 on Linux Ubuntu 16.04. When I go to "make" the samples I get the following:

Scanning dependencies of target example_tutorial_how_to_use_OpenCV_parallel_for_
[ 25%] Building CXX object cpp/CMakeFiles/example_tutorial_how_to_use_OpenCV_parallel_for_.dir/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp.o
/home/pablocore/Desktop/OpenCV/opencv-3.4.3/samples/cpp/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp:45:50: error: expected ‘;’ at end of member declaration
     virtual void operator ()(const Range& range) const CV_OVERRIDE
                                                  ^
/home/pablocore/Desktop/OpenCV/opencv-3.4.3/samples/cpp/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp:45:56: error: ‘CV_OVERRIDE’ does not name a type
     virtual void operator ()(const Range& range) const CV_OVERRIDE
                                                        ^
cpp/CMakeFiles/example_tutorial_how_to_use_OpenCV_parallel_for_.dir/build.make:62: recipe for target 'cpp/CMakeFiles/example_tutorial_how_to_use_OpenCV_parallel_for_.dir/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp.o' failed
make[2]: *** [cpp/CMakeFiles/example_tutorial_how_to_use_OpenCV_parallel_for_.dir/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp.o] Error 1
CMakeFiles/Makefile2:1843: recipe for target 'cpp/CMakeFiles/example_tutorial_how_to_use_OpenCV_parallel_for_.dir/all' failed
make[1]: *** [cpp/CMakeFiles/example_tutorial_how_to_use_OpenCV_parallel_for_.dir/all] Error 2
Makefile:83: recipe for target 'all' failed

make: * [all] Error 2

I'm really really new to all of this so can anyone point me in the right direction? I've tried clearing it and redownloading but it does the same thing. Please give me baby steps. Thanks