Re: Compiling a X application

   I can compile a normal C program using cc or gcc on my NetBSD, but cannot a
 X program.  When I tried to make a program, I got these error messages below.
  I had installed Xbase.tgz and Xcomp.tgz, checked the contents of /etc/ld.so.
conf to find the '/usr/X11R6/lib' entry and softlinked /usr/X11R6/include/X11 
to /usr/include/X11 in advance.   I guess linking didn't succeed, but I don't 
know why. I appreciate your advice.

/var/tmp/cc00214a1.o: Undefined symbol '_XOpenDisplay' referenced from text se
gment
/var/tmp/cc00214a1.o: Undefined symbol '_XCreateSimpleWindow' referenced from 
text segment
/var/tmp/cc00214a1.o: Undefined symbol '_XSetStandardProperties' referenced fr
om text segment
/var/tmp/cc00214a1.o: Undefined symbol '_XSelectInput' referenced from text se
gment
/var/tmp/cc00214a1.o: Undefined symbol '_XMapWindow' referenced from text segm
ent
/var/tmp/cc00214a1.o: Undefined symbol '_XFlush' referenced from text segment
/var/tmp/cc00214a1.o: Undefined symbol '_XNextEvent' referenced from text segm
ent
/var/tmp/cc00214a1.o: Undefined symbol '_XCloseDisplay' referenced from text s
egment

(This is the source code.)

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

main()
{
	Display        *disp;	/* conn to X server */
	Window          win;	/* windows */
	static char     window_name[] = "Hello !";

	if ((disp = XOpenDisplay(NULL)) == NULL) {
		fprintf(stderr,
			"cannot connect to X server.\n");
		exit(-1);
	}
	/* Request for creating a window */

	win = XCreateSimpleWindow(disp, RootWindow(disp, 0),
				  0, 0, 300, 300, 2,
				  BlackPixel(disp, 0),
				  WhitePixel(disp, 0));

	XSetStandardProperties(disp, win, window_name,
			 NULL, NULL, NULL /* argv */ , 0 /* argc */ , NULL);
	XSelectInput(disp, win, ButtonPressMask);
	XMapWindow(disp, win);
	XFlush(disp);

	/* Event Handling Loop */
	while (1) {
		XEvent          report;

		XNextEvent(disp, &report);
		if (report.type == ButtonPress) {
			switch (((XButtonEvent *) & report)->button) {
			case Button1:
				printf("Left button pressed.\n");
				break;
			case Button3:
				printf("Right button pressed.\n");
				printf("Now Closing Connection.\n");
				XCloseDisplay(disp);
				return 0;
			default:
				break;
			}
		}
	}
}

--
Robert