Sometimes in a project, we need to maintain different version of OpenCV and link to it in organised way. This can be template for your cmake project.

cmake_minimum_required(VERSION 3.1)

project( DisplayImage )

# Enable C++11

# For OpenCV 4
SET(OpenCV_DIR <current-path>/OpenCV-master/lib/cmake/opencv4)

# For OpenCV 3
# SET(OpenCV_DIR "<current-path>/opencv3.4.8/installation/OpenCV-3.4.8/share/OpenCV/")

# 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 " version: ${OpenCV_VERSION}")
message(STATUS " libraries: ${OpenCV_LIBS}")
message(STATUS " include path: ${OpenCV_INCLUDE_DIRS}")

find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable( DisplayImage main.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )

I have detailed explained the instalation and running an example using OpenCV C++ here.

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Yes, but in order to install it, you need

Thanks to Satya Mallik and, they have written customised bash script to install opencv without any hasel. We will add more to it in this blog.

>> wget

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