XCreateImage returns NULL

[Mikhail Teterin]

Hello!

I have a weird problem on two machines already (both running FreeBSD-7, one is 
i386, the other -- amd64). Both have xorg-libraries-7.3_1 installed:

	xorg-docs-1.3,1/            xorg-fonts-miscbitmaps-7.2/
	xorg-fonts-100dpi-7.2/      xorg-fonts-truetype-7.2/
	xorg-fonts-7.2/             xorg-fonts-type1-7.2/
	xorg-fonts-75dpi-7.2/       xorg-libraries-7.3_1/
	xorg-fonts-cyrillic-7.2/    xorg-server-1.4_5,1/

The editors/xcoral port builds, but the installed executable dies on startup, 
because the call to

2839      image = XCreateImage(dpy, 
2840                              DefaultVisual(dpy,DefaultScreen(dpy)),
2841                              DefaultDepth(dpy,DefaultScreen(dpy)),
2842                              ZPixmap,
2843                              0,
2844                              data,
2845                              wp, hp, 32,
2846                              wp * bytes_per_pixel);

returns NULL and the next line:

2847      image->bits_per_pixel = DefaultDepth(dpy,DefaultScreen(dpy));

dies. I'm not an expert on X11-programming, but the manual page does not even 
describe possible reasons for failure, nor explains, how to query them 
(errno?)

Also, in ALL of the examples, I could find online, nobody ever checks, what 
XCreateImage returns:

	http://www.codase.com/search/call?name=xcreateimage&start=10

It just is not supposed to fail, I guess -- but crashes here 100%...

Any ideas? Thanks!

	-mi