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Well, I don't know.. only that I experienced that problem with common lisps
before due to a version problem.
I'm confident that this will tell you, after looking at old & new CLX sources
and trying with old & new versions.
[This should work for any dialect of commom lisp, with most any version of CLX.]
(if (and (boundp 'xlib::*version*)
(string> xlib::*version* "MIT R4.2"))
"This should be recent enough"
"You don't have the more recent version.")
(if (not (find-symbol "ATOM-ID-MAP" (find-package "XLIB")))
"You definitely need the newer version."
"Well, I'm sorry; I don't know what the problem is.")