help me about opencv on raspberrypi

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hi guys i bought a raspberrypi(raspbian). i installed opencv in it. i found a few simple programs on net and i wrote them on terminal. but when i compiled them with "g++ -o example example.cpp" i took some errors.sometimes those errors were about libraries. what can i do about it? u can give me example to try it. can u suggest any source? i didnt even take a photo with codes. PLEASE help me :(.. :(