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I think the opencv/-headers are just legacy and should be replaced by the opencv2-headers. If you have a look at the old headers, they just include the new opencv2-headers. I can compile your code with these headers:

#include <opencv2 core="" core.hpp=""> #include <opencv2 highgui="" highgui.hpp="">

g++ foo.cpp -lopencv_core -lopencv_highgui

But there are also a logical error: You use argv[2] before checking if argc is 2.

I think the opencv/-headers are just legacy and should be replaced by the opencv2-headers. If you have a look at the old headers, they just include the new opencv2-headers. I can compile your code with these headers:

 #include <opencv2 highgui="" highgui.hpp="">
<opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
  
 g++ foo.cpp -lopencv_core -lopencv_highgui-lopencv_highgui