我正在尝试从OpenCV构建scene_reconstruction.cpp示例，但是我有以下错误：
In file included from /usr/local/include/opencv2/sfm.hpp:42:0,
from scene_reconstruction.cpp:1:
/usr/local/include/opencv2/sfm/numeric.hpp:41:22: fatal error: Eigen/Core: No such file or directory
compilation terminated.
但我确实安装了eigen。我尝试使用BUILD_EXAMPLE = ON标志构建opencv，使用make的建筑物将终止于9％内置目标opencv_python3
有人可以向我解释一下吗？