Ubuntu – If I already have opencv python, do I need to install opencv C++ to build C++ code, or do I need to set dependencies?

I’ve already been having opencv python on my system for quite some time now for I work predominantly in python3. Now, however, I have been trying to run a repo written in C++ which uses opencv C++.

I didn’t install opencv C++ because I thought that opencv python is just a wrapper around opencv C++, so it must be having the code needed to run opencv C++ anyway.

Upon running make,though, I get errors such as undefined reference to 'cv::String::deallocate()'

I am looking at other links such as Undefined reference to `cv::String::deallocate()' error in OpenCV 3.4.3 and What is an undefined reference/unresolved external symbol error and how do I fix it?, but that’s confusing me a bit more. How do I go about setting the dependency mentioned in the 1st link?

EDIT: Following this the last part of the output of the make command, which is were I get errors:

The part of my Makefile handling opencv has the OPENCV_CFLAGS and OPENCV_LIBS flags. Here is a part of the Makefile:-

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P.S.: I have found that allocate() and deallocate() have been declared in cvstd.hpp and I see definitions for them in the same file. But I’m not sure why the linker can’t find it.

Also, my Makefile has dependencies such as -lopencv_core -lopencv_highgui -lopencv_imgproc are already set. I don’t why I’m still getting a link error.

P.P.S.: I am new to C++, so much of the code compilation process is unfamiliar to me. Any help would be much appreciated.