编译opencv2.4.11时出现错误：error: ‘NppiGraphcutState’ has not been declared

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。