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I have two Opencvs, opencv-2.4.10 is installed in /usr and opencv-3.1 is installed in /usr/local. I can set the opencv path in Eclipse easily. In cmake, how can I set the path for one of the opencvs I like to use for that project? Thanks

batuman
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    Possible duplicate of [How to force c++ compiler use one of different installed package's versions, using CMake?](https://stackoverflow.com/questions/28507214/how-to-force-c-compiler-use-one-of-different-installed-packages-versions-usi) – Gabriel Devillers Jun 26 '17 at 08:58

3 Answers3

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This question is a duplicate of How to force c++ compiler use one of different installed package's versions, using CMake? but it is found by search engines so I add the answer from texasflood that I found to be working with CMake 2.8.12.2 and OpenCV 3.2.0 on Ubuntu 12.4:

Simply change the find_package command:

find_package(OpenCV REQUIRED PATHS "/usr/opencv-2.4.10")
Gabriel Devillers
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None of the other answers worked for me (linux, opencv 4.0.0, haven't tested yet with opencv 3.x.x).

Adding the following before the line find_package(...) in the CMakeLists.txt worked:

set(OpenCV_DIR /path/to/opencv_install_dir/lib/cmake/opencv4)

If opencv was compiled from source with a none standard installation target directory, then /path/to/opencv_install_dir is (should be) known, otherwise search for the location of the directory structure lib/cmake/opencv*.

Martin Valgur
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calocedrus
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I don't have a Linux machine to test it on but this is how I do it on Windows 10 64bit.

I only added a line in the CmakeLists.txt in my program to set the variable OpenCV_DIR used by CMake.

For example, if OpenCV is installed in C:/opencv, I add 

SET("OpenCV_DIR" "C:/opencv")

in my CMakeLists.txt.

In your case, it should be something like

SET("OpenCV_DIR" "/usr/opencv-2.4.10")

But, as I said, I never tested this on Linux.

Sunreef
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  • No not yet. I set as SET("OpenCV_DIR" "/usr/share/OpenCV"). But it doesn't link. – batuman Jun 08 '16 at 01:21
  • @batuman Make sure you also have the lines: find_package(OpenCV REQUIRED), include_directories(${OpenCV_INCLUDE_DIRS}) and target_link_libraries(Program ${OpenCV_LIBS}) in your CMakeLists. Otherwise it's not going to do anything – Sunreef Jun 08 '16 at 05:59
  • Make sure also, that the directory you specified is the directory where OpenCV is built, not the sources. – Sunreef Jun 08 '16 at 06:06
  • Did not work for me (CMake 2.8.12.2, OpenCV 3.2.0, Ubuntu 12.4), see my answer instead. – Gabriel Devillers Jun 26 '17 at 09:14