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I have a problem linking OpenCV in Xcode. I installed OpenCV using brew: brew tap homebrew/science sudo brew install opencv I started a new Xcode commandline project, added /usr/local/lib and /usr/local/include to library and header search path. I also added the output of pkg-config --libs opencv to other linker options . But when I try to compile this small sample program: #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> int main(int argc, char *argv[]) { cv::Mat test; cv::namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display. cv::waitKey(0); // Wait for a keystroke in the window return 0; } i get the following linker error: Undefined symbols for architecture x86_64: "cv::namedWindow(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int)", referenced from: _main in main.o ld: symbol(s) not found for architecture x86_64 But I am able to compile the program on the command line using g++ `pkg-config --cflags --libs opencv` prog.cpp So I think the problem is the way Xcode is set up. But I am not able to determine what exactly is different between the way Xcode compiles and my commandline argument. Does anyone know the reason for this error or has an idea what I could try to investigate the problem?

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