How can I use cmake's find_packge(OpenCV) on gitlab - c++

Question

I am using cmake to compile a c++ and OpenCV project. and I want to run my tests on Gitlab but got some errors. My question is: How can I use find_package(OpenCV REQUIRED) in CMakeLists.txt on gitlab? this is my CMakeLists.txt: (by the way, it works correct locally on my Linux machine .)
# cmake minimum requiredments
cmake_minimum_required(VERSION 3.16 FATAL_ERROR)
# project name
project(imageEnhancer LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_EXTENSIONS OFF) # disable compiler specific extensions
set(CMAKE_CXX_STANDARD_REQUIRED ON)
find_package(Catch2 QUIET)
if (NOT Catch2_FOUND)
message("Catch2 not found")
include(FetchContent)
FetchContent_Declare(
catch2
GIT_REPOSITORY https://github.com/catchorg/Catch2.git
GIT_TAG v2.11.0
)
FetchContent_MakeAvailable(catch2)
list(APPEND CMAKE_MODULE_PATH "${catch2_SOURCE_DIR}/contrib")
endif()
# search for OpenMP
find_package(OpenMP REQUIRED)
# search for OpenCV
find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
# add a library to the project using the specified source files
add_library(opencv STATIC include/opencvtest.h src/opencvtest.cpp)
# PUBLIC -> targets that link to this target get that include directory
target_include_directories(opencv PUBLIC include PRIVATE src)
# link to the imported target provided by the FindOpenMP moudule
target_link_libraries(opencv PUBLIC OpenMP::OpenMP_CXX)
# Create executable with name imageEnhancer
add_executable(imageEnhancer main.cpp)
# linke to the imported target provided by the FindOpenMP module
target_link_libraries(imageEnhancer PUBLIC OpenMP::OpenMP_CXX ${OpenCV_LIBS})
but I got the following error:
$ cd project
$ mkdir -p build
$ cd build
$ cmake ..
-- The CXX compiler identification is GNU 10.2.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/local/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
Catch2 not found
-- Found OpenMP_CXX: -fopenmp (found version "4.5")
-- Found OpenMP: TRUE (found version "4.5")
CMake Error at CMakeLists.txt:31 (find_package):
By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "OpenCV", but
CMake did not find one.
Could not find a package configuration file provided by "OpenCV" with any
of the following names:
OpenCVConfig.cmake
opencv-config.cmake
Add the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH or set
"OpenCV_DIR" to a directory containing one of the above files. If "OpenCV"
provides a separate development package or SDK, be sure it has been
installed.
-- Configuring incomplete, errors occurred!
See also "/builds/davood_hadiannejad/algorithm-engineering-lab/project/build/CMakeFiles/CMakeOutput.log".
Cleaning up file based variables
00:01
ERROR: Job failed: exit code 1
and I tried to solve it like, but it didn't work
if (NOT Catch2_FOUND)
message("Catch2 not found")
include(FetchContent)
FetchContent_Declare(
OpenCV
GIT_REPOSITORY https://github.com/opencv/opencv.git
)
FetchContent_MakeAvailable(OpenCV)
list(APPEND CMAKE_MODULE_PATH "${OpenCV_SOURCE_DIR}/contrib")
endif()
any suggestion? thanks in advance