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2.3 Search Path

GCC looks in several different places for headers. On a normal Unix system, if you do not instruct it otherwise, it will look for headers requested with #include <file> in:

     /usr/local/include
     libdir/gcc/target/version/include
     /usr/target/include
     /usr/include

#include "opencv/cv.h"
#include "opencv/highgui.h"
int main ( int argc, char **argv )
{
        cvNamedWindow( "My Window", 1 );
        IplImage *img = cvCreateImage( cvSize( 640, 480 ), IPL_DEPTH_8U, 1 );
        CvFont font;
        double hScale = 1.0;
        double vScale = 1.0;
        int lineWidth = 1;

        cvInitFont( &font, CV_FONT_HERSHEY_SIMPLEX | CV_FONT_ITALIC, hScale, vScale, 0, lineWidth );
        cvPutText( img, "Hello World!", cvPoint( 200, 400 ), &font, cvScalar( 255, 255, 0 ) );
 
        cvShowImage( "My Window", img );
        cvWaitKey();

        return 0;
}

Display Names

From the user's perspective, every X server has a display name of the form:

This information is used by the application to determine how it should connect to the server and which screen it should use by default (on displays with multiple monitors):

hostname

The hostname specifies the name of the machine to which the display is physically connected. If the hostname is not given, the most efficient way of communicating to a server on the same machine will be used.