安装cuda之后再安装opencv时出现错误：
/data/opencv-2.4.11/modules/gpu/src/graphcuts.cpp:120:54: error: ‘NppiGraphcutState’ has not been declared
typedef NppStatus (*init_func_t)(NppiSize oSize, NppiGraphcutState** ppStat ^ /data/opencv-2.4.11/modules/gpu/src/graphcuts.cpp:135:18: error: ‘NppiGraphcutState’ does not name a type operator NppiGraphcutState*() ^ /data/opencv-2.4.11/modules/gpu/src/graphcuts.cpp:141:9: error: ‘NppiGraphcutState’ does not name a type NppiGraphcutState* pState;
cuda8.0较新，opencv-2.4.11较早，要编译通过需要修改源码：
修改/data/opencv-2.4.11/modules/gpu/src/graphcuts.cpp
将
#if !defined (HAVE_CUDA) || defined (CUDA_DISABLER)
改为
#if !defined (HAVE_CUDA) || defined (CUDA_DISABLER) || (CUDART_VERSION >= 8000)
重新编译即可。