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main.cpp:(.text+0x51): undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' Code Example
main.cpp:(.text+0x51): undefined reference to `cv::imread(std::__cxx11::basic_string, std::allocator > const&, int)' 

That means, you're not linking some required lib,

(in your case, ALL of the opencv libs are missing from the cmdline !)

try again with:

g++ main.cpp -I/opt/robots/pepper/ctc-linux64-atom-2.5.10.7/opencv2/include/ -L/opt/robots/pepper/ctc-linux64-atom-2.5.10.7/opencv2/lib -lopencv_core -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_videoio
main.cpp:(.text+0x51): undefined reference to `cv::imread(std::__cxx11::basic_string, std::allocator > const&, int)' 
 --> My custom command that live sin my /usr/bin folder , that runs my cv2 cpp files  just fine without any problems  
 --> that may help someone 

#!/bin/bash 

file=$@

if [ "${file: -4}" = ".cpp"  ]; then 
        g++ $file -I/opt/robots/pepper/ctc-linux64-atom-2.5.10.7/opencv2/include/ -L/opt/robots/pepper/ctc-linux64-atom-2.5.10.7/opencv2/lib -lopencv_core -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_videoio 
    if $status ; then 
        ./a.out && rm -rf a.out
    fi
else
    echo "This Command should be used only with cpp files that uses the opencv library !!"
fi
Source: stackoverflow.com



Cpp

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