Could not find module FindOpenCV.cmake ( Error in configuration process)

Question

I wrote a CMakeLists.txt for a project in C++, which uses OpenCV libraries. When I try to create the project using cmake, I get the next configuration problem:

CMake Error at CMakeLists.txt:15 (find_package):
  Could not find module FindOpenCV.cmake or a configuration file for package
  OpenCV.

  Adjust CMAKE_MODULE_PATH to find FindOpenCV.cmake or set OpenCV_DIR to the
  directory containing a CMake configuration file for OpenCV.  The file will
  have one of the following names:

    OpenCVConfig.cmake
    opencv-config.cmake

The fact is that I have an environment variable for the path which I use in Visual Studio with no problems. If I don't include OpenCV, then I can configure and generate with no problem, but I need to solve the problem. I don't understand why cmake cannot find the OpenCV path or how to fix it.

I also used the recommendations mentioned in this link: FindOpenCV.cmake

Does anybody had this problem too?

score 41 · Accepted Answer · edited Jan 04 '18 at 20:00

41

The error you're seeing is that CMake cannot find a FindOpenCV.cmake file, because cmake doesn't include one out of the box. Therefore you need to find one and put it where cmake can find it:

You can find a good start here. If you're feeling adventurous you can also write your own.

Then add it somewhere in your project and adjust CMAKE_MODULE_PATH so that cmake can find it.

e.g., if you have

CMakeLists.txt
cmake-modules/FindOpenCV.cmake

Then you should do a

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake-modules)

In your CMakeLists.txt file before you do a find_package(OpenCV)

edited Jan 04 '18 at 20:00

Pierre.Sassoulas

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answered Jan 03 '12 at 15:41

alanxz

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Thanks, but I have tried all of this. I read forums ffrom people with similar problems and they suggested to set the paths. I downloaded the FindOpenCV, I defined the variables with the paths, I moved the OpenCV folder to different paths, I directly linked the opencvConfig.cmake, but the error is always the same. cmake cannot find my opencv folder! At least now I understand cmake language, xD. – Jav_Rock Jan 03 '12 at 16:28
3

Ok so cmake is actually using FindOpenCV.cmake? Now its having trouble finding OpenCV library/headers? – alanxz Jan 03 '12 at 16:44
2

No, just cannot find the OpenCV_DIR, even if I manually write it, even if I set a variable inside the cmakelists. – Jav_Rock Jan 03 '12 at 16:52
3

CMake is actually using FindOpenCV.cmake. Problem 1 solved. Have you tried setting it manually using a command line option like cmake -DOpenCV_DIR=/path/to/opencv ? Another option is to set this using ccmake or cmake-gui. – alanxz Jan 03 '12 at 16:57
2

I use cmake GUI, and I tried to manually modify the variable OpenCV_DIR in the graphic interface, but when I press configure the GUI says it cannot be found. I will keep trying and if I find the solution I will port it here. thanks. – Jav_Rock Jan 04 '12 at 08:04
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Try to define CMAKE_PREFIX_PATH variable and set it to the dir, where OpenCV is installed. – arrowd Jan 04 '12 at 08:26
2

The problem was that my FindOpenCV.cmake wasn't installed. I had to run cmake on OpenCV folder, then the FindOpenCV.make appeared in the propper format and finally cmake could find the package as the CMAKE_MODULE_PATH was correct. – Jav_Rock Sep 06 '12 at 08:22
1

The link supplied after "Edit:" above (by @GWW?) is actually not to an example of FindOpenCV.cmake but to an example of OpenCVConfig.cmake, which has a slightly different purpose. I can see how one might confuse them though, since that is what I did initially. Modern CMake can actually do without FindOpenCV.cmake, which makes things a little simpler. See [my question and answer](http://stackoverflow.com/questions/39278472/what-obstacles-must-i-overcome-to-install-opencv-with-clion-under-windows/39278762#39278762) for details on Windows, some of which apply to CMake / OpenCV generally. – CODE-REaD Sep 02 '16 at 14:03
1

The answer works for me & the `OpenCVConfig.cmake` located at the OpenCV distribution. For example, [in official release binary for Windows](http://opencv.org/releases.html) could be located in `build\x64\vc14\lib\OpenCVConfig.cmake`. Just export it like `cmake .. -DOpenCV_DIR=\build\x64\vc14\lib` – N0dGrand87 Sep 29 '17 at 12:45
The answer worked for me, but only if I copied the suggested FindOpenCV.cmake to C:\OpenCV\build. Then, it can find the appropriate libraries by appending the architecture (e.g. x64), the runtime (e.g. vc14) and 'lib' to the path -> C:\OpenCV\build\x64\vc14\lib". In this folder, it can find the necessary OpenCVConfig.cmake – gebbissimo Mar 10 '20 at 12:44
On Ubuntu, despite having installed OpenCV (via apt-get), there is apparently no `OpenCVConfig.cmake` or `opencv-config.cmake` *anywhere* on my hard drive. – sh37211 Nov 19 '20 at 02:42
Doesn't that come with the -dev packages? It should... (linux) Yes, it does. Just install libopencv-dev (debian) or similar. – Sandburg Jan 15 '22 at 10:18

score 31 · Answer 2 · answered Jun 06 '13 at 10:28

31

If you are on Linux, you just need to fill the OpenCV_DIR variable with the path of opencv (containing the OpenCVConfig.cmake file)

export OpenCV_DIR=<path_of_opencv>

answered Jun 06 '13 at 10:28

leszek.hanusz

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Should be export OpenCV_DIR= – Priyanshu Jul 05 '16 at 04:24
1

On Windows for PowerShell `$env:OpenCV_DIR = "C:\path_of_opencv\build"` – Mikolasan Jul 17 '20 at 19:12
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On Linux, not need. Just install *libopencv-dev* it will fill the gaps. – Sandburg Jan 15 '22 at 10:23

score 24 · Answer 3 · answered Oct 04 '14 at 12:56

24

apt-get install libopencv-dev
export OpenCV_DIR=/usr/share/OpenCV
the header of cpp file should contain: #include #include "opencv2/highgui/highgui.hpp"

#include #include

not original cv.h

answered Oct 04 '14 at 12:56

gaoxincun

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only 1st step needed on my side: `apt-get install libopencv-dev` – Remy Mellet Sep 15 '20 at 20:42
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On my side, the path was `/usr/lib/x86_64-linux-gnu/cmake/opencv4` – VanDavv Jul 26 '21 at 12:15
@RemyMellet your solution fixed my problem, thank you – Francesco Taioli Oct 11 '21 at 13:33

score 20 · Answer 4 · answered Jul 24 '16 at 03:40

20

find / -name "OpenCVConfig.cmake"

export OpenCV_DIR=/path/found/above

answered Jul 24 '16 at 03:40

user6630590

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please provide some explanation with your answer – Milad Faridnia Jul 24 '16 at 04:00
`find / -name "OpenCVConfig.cmake"` searches your file system for that file. `export OpenCV_DIR=/path/found/above` lets CMake know where that file is located. – koko Apr 12 '21 at 04:54

score 17 · Answer 5 · edited Aug 22 '16 at 12:47

17

I had this exact same problem. I fixed it by adding the following line to my FindOpenCV.cmake file. Put it anywhere at the top before the rest of the code.

set (OpenCV_DIR /home/cmake/opencv/compiled) #change the path to match your complied directory of opencv

Basically you are telling FindOpenCV.cmake where to find opencv files assuming the other compilation can find the FindOpenCV.cmake

edited Aug 22 '16 at 12:47

Patrick B.

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answered Mar 23 '12 at 07:06

penner

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This worked for me. I set the path of OPENCV_DIR to that of the opencv build folder – user27665 Jun 18 '20 at 14:26
`_DIR` variables are designed to be set by the user at the command line. Even more importantly, you should _**never**_ put absolute paths to your _home folder_ (of all places!) in your CMakeLists.txt!! – Alex Reinking Jun 16 '21 at 19:27

score 6 · Answer 6 · answered May 19 '17 at 09:27

6

I faced the same error. In my case this "OpenCVConfig.cmake" file is located in /usr/local/share/OpenCV. In CMakeLists.txt add the line

set(OpenCV_DIR /usr/local/share/OpenCV)

as suggested by the error message.

answered May 19 '17 at 09:27

YuZ

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I had installed opencv in a new location /usr/local/opencv-3.3.0. I used set(OpenCV_DIR /usr/local/opencv-3.3.0/share/OpenCV). I didnt have to set CMAKE_MODULE_PATH. CMakeLists.txt :project( opencv_detect_version ) set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11") cmake_minimum_required(VERSION 2.8) set(OpenCV_DIR /usr/local/opencv-3.3.0/share/OpenCV) find_package( OpenCV CONFIG REQUIRED ) add_executable( opencv_detect_version opencv_detect_version.cpp ) target_link_libraries( opencv_detect_version ${OpenCV_LIBS} ) – user27665 Oct 04 '17 at 05:45
on Ubuntu: `ls: cannot access '/usr/local/share/OpenCV': No such file or directory` – sh37211 Nov 19 '20 at 02:44

score 3 · Answer 7 · answered Jul 29 '14 at 14:13

Another possibility is to denote where you can find OpenCV_DIR in the CMakeLists.txt file. For example, the following cmake scripts work for me:

cmake_minimum_required(VERSION 2.8)

project(performance_test)

set(OpenCV_STATIC ON)
set(OpenCV_CUDA OFF)
set(OpenCV_DIR "${CMAKE_SOURCE_DIR}/../install")

find_package(OpenCV REQUIRED)

include_directories(${OpenCV_INCLUDE_DIRS})

link_directories(${OpenCV_LIB_DIR})

file(GLOB my_source_files ./src/*)

add_executable( performance_test ${my_source_files})

target_link_libraries(performance_test ${OpenCV_LIBS})

Just to remind that you should set OpenCV_STATIC and OpenCV_CUDA as well before you invoke OpenCVConfig.cmake. In my case the built library is static library that does not use CUDA.

score 3 · Answer 8 · answered Jul 14 '15 at 13:23

3

if you are on windows, you can add opencv path to OpenCV_DIR yourself. (OpenCV_DIR is in the red region)

the path is like "D:/opencv244/build".

you can find file "OpenCVConfig.cmake" under the path.

answered Jul 14 '15 at 13:23

user4728427

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On windows make SURE to use "/" instead of the normal slash! – agodinhost Sep 15 '15 at 19:42
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Setting OPENCV_DIR=C:/opencv/build/ doesn't fix a problem for me on Windows, even though I have C:\opencv\build\OpenCVConfig.cmake... – Stepan Yakovenko Aug 22 '16 at 23:25
1

This works for me. No need for OpenCVConfig.cmake, just set OpenCV_DIR to C:/OpenCVx.y.z/**Build** – smirkingman Dec 08 '18 at 13:18

score 2 · Answer 9 · answered Feb 10 '22 at 20:35

2

For me (on Ubuntu), I just run:

sudo apt-get install libopencv-dev

answered Feb 10 '22 at 20:35

Drioueche Mohammed

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score 1 · Answer 10 · answered Oct 18 '13 at 11:43

On my Fedora machine, when I typed "make" I got an error saying it could not find "cv.h". I fixed this by modifying my "OpenCVConfig.cmake" file.

Before:

SET(OpenCV_INCLUDE_DIRS "${OpenCV_INSTALL_PATH}/include/opencv;${OpenCV_INSTALL_PATH}/include")

SET(OpenCV_LIB_DIR "${OpenCV_INSTALL_PATH}/lib64")

After:

SET(OpenCV_INCLUDE_DIRS "/usr/include/opencv;/usr/include/opencv2")

SET(OpenCV_LIB_DIR "/usr/lib64")

score 1 · Answer 11 · answered Dec 16 '16 at 14:57

I am using Windows and get the same error message. I find another problem which is relevant. I defined OpenCV_DIR in my path at the end of the line. However when I typed "path" in the command line, my OpenCV_DIR was not shown. I found because Windows probably has a limit on how long the path can be, it cut my OpenCV_DIR to be only part of what I defined. So I removed some other part of the path, now it works.

score 1 · Answer 12 · answered May 29 '17 at 21:52

1

I had the same error, I use windows. I add "C:\opencv\build" (opencv folder) to path at the control pannel. So, That's Ok!!

answered May 29 '17 at 21:52

Albert Yun

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aguadopd · Answer 13 · 2014-03-07T02:12:16.580

Followed @hugh-pearse 's and @leszek-hanusz 's answers, with a little tweak. I had installed opencv from ubuntu 12.10 repository (libopencv-)* and had the same problem. Couldn't solve it with export OpenCV_DIR=/usr/share/OpenCV/ (since my OpenCVConfig.cmake whas there). It was solved when I also changed some lines on the OpenCVConfig.cmake file:

# ======================================================
# Include directories to add to the user project:
# ======================================================

# Provide the include directories to the caller

#SET(OpenCV_INCLUDE_DIRS "${OpenCV_INSTALL_PATH}/include/opencv;${OpenCV_INSTALL_PATH}/include")

SET(OpenCV_INCLUDE_DIRS "/usr/include/opencv;/usr/include/opencv2")
INCLUDE_DIRECTORIES(${OpenCV_INCLUDE_DIRS})

# ======================================================
# Link directories to add to the user project:
# ======================================================

# Provide the libs directory anyway, it may be needed in some cases.

#SET(OpenCV_LIB_DIR "${OpenCV_INSTALL_PATH}/lib")

SET(OpenCV_LIB_DIR "/usr/lib")

LINK_DIRECTORIES(${OpenCV_LIB_DIR})

And that worked on my Ubuntu 12.10. Remember to add the target_link_libraries(yourprojectname ${OpenCV_LIBS}) in your CMakeLists.txt.

score -2 · Answer 14 · answered Jun 14 '21 at 18:20

When you install the libraries in the c drive (windows). the CMakeLists.txt shoud be looking like below:

cmake_minimum_required(VERSION 3.0.0)
project(test_opencv VERSION 0.1.0)

include(CTest)
enable_testing()

find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})

add_executable(test_opencv main.cpp)

target_link_libraries(test_opencv ${OPENCV_LIBS})

set(CPACK_PROJECT_NAME ${PROJECT_NAME})
set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
include(CPack)

finding the package and include directories

when building the project in VS code. Run the visual studio code with admin rights as the OpenCV is installed inside C drive.

Could not find module FindOpenCV.cmake ( Error in configuration process)

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