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OpenCV 2.4.9 and CUDA 6.5: "No GPU Support found"

I have installed CUDA 6.5 toolkit according to the instructions on NVIDIA website. Also I did compile the libraries via CMake. However when I am trying to compile a program which reads in image and displays it, I am getting the following OpenCV error "OpenCV Error: No GPU support (The library is compiled without CUDA support)". I did recompiled the libraries via CMake again but all in vain. I have started wondering if OpenCV 2.4.9 supports CUDA 6.5 or is there another version that I need to install?