在CMakeLists.txt 当中添加你的opencv.hpp 路径即可。
我的opencv.hpp 在 /usr/include/opencv2/
INCLUDE_DIRECTORIES(/usr/include/opencv2/)文章来源：https://www.toymoban.com/news/detail-650998.html
通过命令include_directories来设置头文件的搜索目录文章来源地址https://www.toymoban.com/news/detail-650998.html
# cmake needs this line
cmake_minimum_required(VERSION 3.1)
# Define project name
project(photo_get_project)
# Find OpenCV, you may need to set OpenCV_DIR variable
# to the absolute path to the directory containing OpenCVConfig.cmake file
# via the command line or GUI
find_package(OpenCV REQUIRED)
INCLUDE_DIRECTORIES(/usr/include/opencv2/)
# If the package has been found, several variables will
# be set, you can find the full list with descriptions
# in the OpenCVConfig.cmake file.
# Print some message showing some of them
message(STATUS "OpenCV library status:")
message(STATUS " config: ${OpenCV_DIR}")
message(STATUS " version: ${OpenCV_VERSION}")
message(STATUS " libraries: ${OpenCV_LIBS}")
message(STATUS " include path: ${OpenCV_INCLUDE_DIRS}")
# Declare the executable target built from your sources
add_executable(photo_get photo_get.cpp)
# Link your application with OpenCV libraries
target_link_libraries(photo_get PRIVATE ${OpenCV_LIBS})
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