cuda更新过后, findcuda找不到怎么办?

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FindCMake.cmake looks for /usr/local/cuda. In your case, that directory might not be there. Just create a symbolic link of that name to your actual CUDA installation directory:

$ sudo ln -s /usr/local/cuda-5.5 /usr/local/cuda
Your CMake should be able to generate the Makefile for your project now.