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

User · Accepted Answer

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

User · Answer

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

User · Answer

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  lt path of opencv gt

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

find   -name  OpenCVConfig cmake   export OpenCV DIR  path found above

User · Answer

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

User · Answer

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

User · Answer

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

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

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