Knoppix and X

[humi001]

Hi.
I have installed knoppix 3.7. Why can't i compile the following code? Do i have to install something so that it compiles correctly?

#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

 
int main()
{        Display *display;
         Window root, win;
	     int screen; 
         int x, y=100;
         unsigned int width=600, height=100;
         unsigned int bord=60;
         unsigned long bord_c=34;
         unsigned long back_c=232;
	     char *display_name = NULL;
	     
    if ( ( display=XOpenDisplay(display_name)) == NULL )
      { fprintf( stderr,"connexion au Xserver %s impossible\n",
                   XDisplayName(display_name));
        exit(-1); }
	
    screen = DefaultScreen(display);
    root= RootWindow(display, screen);
    win = XCreateSimpleWindow(display,  root, 50, 50,
    				width, height, bord, bord_c, back_c);
    XMapWindow(display, win);

   while(1) {
        XEvent ev;
        XNextEvent(display, &ev);
        }
}

[fingers99]

Dear God, it's a long time since I compiled C. What error messages does the compiler come up with? What commands are you issuing to the compiler?

[tom p]

It compiles fine using gcc -o x x.c -L/usr/X11R6/lib -lX11 - given you've called your file x.c; I have to admit that I use a Knoppix 3.7 HD installation, and doubtlessly have added a number of packages, probably also libx11-dev (that package contains the relevant header files) - to repeat fingers99: What error messages does the compiler come up with?

Tom

[humi001]

Thanks tom.

Indeed, i forgot to compile with -lX11.