Linking error

[chaiein]

[100%] Linking CXX executable TestLineMatchingAlgorithm
CMakeFiles/TestLineMatchingAlgorithm.dir/TestLineMatchingAlgorithm.cpp.o: In function main': TestLineMatchingAlgorithm.cpp:(.text.startup+0x101): undefined reference to cv::imread(cv::String const&, int)'
TestLineMatchingAlgorithm.cpp:(.text.startup+0x211): undefined reference to cv::imread(cv::String const&, int)' TestLineMatchingAlgorithm.cpp:(.text.startup+0x877): undefined reference to cv::imwrite(cv::String const&, cv::_InputArray const&, std::vector<int, std::allocator > const&)'
TestLineMatchingAlgorithm.cpp:(.text.startup+0x910): undefined reference to `cv::imwrite(cv::String const&, cv::_InputArray const&, std::vector<int, std::allocator > const&)'
collect2: error: ld returned 1 exit status
CMakeFiles/TestLineMatchingAlgorithm.dir/build.make:95: recipe for target 'TestLineMatchingAlgorithm' failed
make[2]: *** [TestLineMatchingAlgorithm] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/TestLineMatchingAlgorithm.dir/all' failed
make[1]: *** [CMakeFiles/TestLineMatchingAlgorithm.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

How to solve this problem?

[jessicajie]

hello. I solved this problem by modifying the opencv version.
Because I installed two versions of opencv,the one is opencv-2.4.9,the other one is opencv-3.1.0.

Resolvent:

Modify cmakelist.txt:
add :set(OpenCV_DIR "/home/wj/opencv-3.1.0/build/") //this is your opencv-3.1.0's position
find_package( OpenCV REQUIRED )
TARGET_LINK_LIBRARIES(LineMatchingLib ${OpenCV_LIBS} )