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.