problems having compiling programs

[haynes george <hmg_u@xxxxxxxxxxx>]

hi..

i am a newbie who is currently reading a book on
Xwindow applications programming .So there is little
program to connect to an Xserver.
it goes as

#include<stdio.h>
#include<X11/Xlib.h>
main()
{
        Display *display=NULL;
        display=XOpenDisplay((char *)NULL);
        if(display==NULL)
         {
            printf("no connection made..\n");
          }
           else
            printf("connection made.\n");
 }

but when i try to compile this using

gcc -o X.o X.c -lX11 i get the error


-lX11 not found ....

how should i compile this program to run this code??

i am using Redhat 9

thanks

haynes


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