Undefined reference to cv::imread(cv::String const&, int) [duplicate]

Answer 1

This sounds like a problem with linking. I could compile your code without problems using g++:

g++ Test.cpp -L/path/to/my/openCV/lib -lopencv_core -lopencv_imgcodecs -o Test

If you want to use further functions of Open CV you might have to link against additional Open CV libraries.