How resolve the error find_package not providing in CMake [duplicate] - c++

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?

Answer 1

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)

Answer 2

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>

Answer 3

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

Answer 4

find / -name "OpenCVConfig.cmake"
export OpenCV_DIR=/path/found/above

Answer 5

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

Answer 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.

Answer 7

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.

Answer 8

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.

Answer 9

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")

Answer 10

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.

Answer 11

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!!

Answer 12

For me (on Ubuntu), I just run:
sudo apt-get install libopencv-dev

Answer 13

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.

Answer 14

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.