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我正在尝试在 raspberry pi 3 上构建 opencv 3.3.0，但面临 93% 的错误，说转换无效。下面提供了详细信息，任何帮助将不胜感激。请帮忙。

显示此错误消息。

 /home/pi/opencv-3.3.0/modules/python/src2/cv2.cpp: In function ‘bool pyopencv_to(PyObject*, T&, const char*) [with T = cv::String; PyObject = _object]’:/home/pi/opencv-3.3.0/modules/python/src2/cv2.cpp:854:34: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive] char* str = PyString_AsString(obj);In file included from /home/pi/opencv-3.3.0/modules/python/src2/cv2.c

我试过这些命令

cd ~/opencv-3.3.0/

$ mkdir build
$ cd build
$ cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.3.0/modules \
    -D BUILD_EXAMPLES=ON ..

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#cv2.cpp 代码在错误位置。

template<>
bool pyopencv_to(PyObject* obj, String& value, const char* name)
{ …