fatal error: opencv2/core/cvdef.h: 没有此一档案或目录

原文链接：https://blog.csdn.net/finded/article/details/50478779?utm_source=blogxgwz9

一劳永逸的解决办法是添加include的搜索路径,
在~/.bashrc中添加以下两行:

CPLUS_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:/home/appleyuchi/opencv/include/opencv4/
C_INCLUDE_PATH=$C_INCLUDE_PATH:/home/appleyuchi/opencv/include/opencv4/