well, in actual fact, it was because I had older X11 include files lying
around. Not sure if I should bother the mailing list with this trivia, but
just in case anybody else is as stupid as I am.
Sorry.
> I'm very sorry. The problem disappeared after a complete
> recompilation. I must have had some old .o file lying around. It
> works nicely now! Apologies.
>>> My program essentially starts as follows:
>>>
>>> Display * SCX_display = XOpenDisplay ("");
><snip>
><> And there I'm stuck: ScreenCount(SCX_display)==0.
