The cuda_npp_library is not being found correctly on my system (the current work-around for adding libnpp.so to the dependencies doesn't work as this file apparently does not exist as of CUDA 5.5)
The latest release of opencv/cmake/FindCUDA.cmake has an a fix for this.
e9ddb7c08b24d1cfde2c95b325aded1f52105058 on the windev branch already contains a temporary fix. Packaging our own FindCUDA based on OpenCV's is probably sensible for the future.
The cuda_npp_library is not being found correctly on my system (the current work-around for adding libnpp.so to the dependencies doesn't work as this file apparently does not exist as of CUDA 5.5)
The latest release of opencv/cmake/FindCUDA.cmake has an a fix for this.
http://answers.opencv.org/question/14326/problem-of-building-opencv-245-with-cuda-55-rc/
https://github.com/Itseez/opencv/blob/master/cmake/FindCUDA.cmake