在cmake上使用OpenCV进行构建失败

Question

我试图在ubuntu 16.04上使用OpenCV 2.4编译项目。我使用apt-get：

安装了opencv

sudo apt-get install libopencv-dev
sudo apt-get install libopencv-nonfree-dev

但是，在编译项目时，我收到以下错误消息：

undefined reference to `cv::imread(std::string const&, int)'

我的CMakeLists.txt看起来像这样：

cmake_minimum_required(VERSION 3.5)
project(Ex)
find_package(OpenCV REQUIRED )
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c99")

message(STATUS "CMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}}")
message(STATUS "OpenCV_LIBS=${OpenCV_LIBS}")

set(SOURCE_FILES main.cpp)

add_executable(Ex ${SOURCE_FILES})

target_link_libraries(Ex ${OpenCV_LIBS})

set_property(TARGET Ex PROPERTY C_STANDARD 99)

有谁知道如何解决这个问题？

修改

第二条消息的输出是

OpenCV_LIBS=opencv_videostab;opencv_video;opencv_ts;opencv_superres;opencv_stitching;opencv_photo;opencv_ocl;opencv_objdetect;opencv_nonfree;opencv_ml;opencv_legacy;opencv_imgproc;opencv_highgui;opencv_gpu;opencv_flann;opencv_features2d;opencv_core;opencv_contrib;opencv_calib3d