CMake

opencv安装到指定路径

git clone https://github.com/opencv/opencv.git
cd opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=指定的安装位置 ..
make  或 make -j7
make install # optional

指定路径下的

cmake_minimum_required(VERSION 2.8.3)
PROJECT (OPENCVTEST)

#寻找OpenCV库
find_package(OpenCV 4.0 REQUIRED PATHS "opencv安装地址")
include_directories(${OpenCV_INCLUDE_DIRS})
message(STATUS "Opencv lib")
message(STATUS "        version:${OpenCV_VERSION}")
message(STATUS "        libdir:${OpenCV_LIBS}")
message(STATUS "        includedir:${OpenCV_INCLUDE_DIRS}")

set(SRC_LIST  
             opencv_test.cpp)

add_executable(opencv_test ${SRC_LIST})
target_link_libraries(opencv_test ${OpenCV_LIBRARIES})

或者直接在使用的时候使用

find_package(OpenCV 4.2.0 REQUIRED EXACT)