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Compiling this 3-line long program impossible in all IDE's

I have a C++ project in Anjunta. How do I compile this code:

Code:

#include <iostream>

#include <X11/Xlib.h>

int main()

{

        Display* d = XOpenDisplay (0);

        std::cout << "Hello world" << std::endl;

        return 0;

}

Quote:

undefined reference to 'XOpenDisplay'

I know about the "-L/usr/X11R6/lib -lX11" options. What I DON'T understand where I should put them.
It's the same in all IDE's, I've tried KDevelop, Eclipse, and now Anjunta, and I don't understand how to link a library in any of them. No matter what I do it won't work.

Thank you for the reply.

It worked with 'usr/X11R6/lib64' instead of 'usr/X11R6/lib'

:study:

Anyway, it was my first library link in Linux so I didn't know if I was doing it right, good thing is: I did. Except for the wrong path.