问题描述：

By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH this project has
 asked CMake to find a package configuration file provided by "OpenCV", but
 CMake did not find one.Could not find a package configuration file provided by "OpenCV" with any
 of the following names:OpenCVConfig.cmake
 opencv-config.cmakeAdd the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH or set
 "OpenCV_DIR" to a directory containing one of the above files. If "OpenCV"
 provides a separate development package or SDK, be sure it has been
 installed.

解决方案：

首先使用指令搜索OpenCVConfig.cmake文件的路径：

locate OpenCVConfig.cmake

然后，在CmakeLists.txt中添加：

set(OpenCV_DIR home/haha/opencv)

说明：home/haha/opencv 为OpenCVConfig.cmake所在路径

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Ubuntu cmake error：Could not find a package configuration file provided by “OpenCV“_公众号