Copy the entry about subtly incompatible toolkit versions from the

trunk.

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 723214132b72b3120530b42282279f452a9dea18..c33f6588ad8d86c0f516507b2f98c7789ba3cf9f 100644 (file)
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -200,6 +200,17 @@ click in a scroll bar might be ignored by the scroll bar widget.  This
 is probably a bug in Xaw3d; when Xaw3d is compiled with arrows, the
 problem disappears.
 
+* There are known binary incompatibilities between Xaw, Xaw3d, neXtaw,
+XawM and the few other derivatives of Xaw.  So when you compile with
+one of these, it may not work to dynamically link with another one.
+For example, strange problems, such as Emacs exiting when you type
+"C-x 1", were reported when Emacs compiled with Xaw3d and libXaw was
+used with neXtaw at run time.
+
+The solution is to rebuild Emacs with the toolkit version you actually
+want to use, or set LD_PRELOAD to preload the same toolkit version you
+built Emacs with.
+
 * Clicking C-mouse-2 in the scroll bar doesn't split the window.
 
 This currently doesn't work with scroll-bar widgets (and we don't know