qt5base-lts/config.tests/unix/opengldesktop/opengldesktop.cpp

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#ifdef __APPLE__
#include <OpenGL/gl.h>
#else
#include <GL/gl.h>
#endif

int main(int, char **)
{
    glBegin(GL_TRIANGLES);
        glVertex2f(20.0f, 10.0f);
        glVertex2f(10.0f, 30.0f);
        glVertex2f(20.0f, 50.0f);
    glEnd();
    return 0;
}