If XLookupKeysym() returned an XFree86 "special key", ignore it. Fixes Sh-F11. src/ChangeLog addition: 2011-08-27 Aidan Kehoe <kehoea@parhasard.net> * config.h.in: Make HAVE_X11_XF86KEYSYM_H available here. * event-Xt.c: #include X11/XF86keysym.h if available. * event-Xt.c (x_event_to_emacs_event): If XLookupKeysym () returned one of the XFree86 "special action keys" for the shifted keysym, treat that as NoSymbol, fixing a long-standing bug with shifted function keys under X.org. Details of why in: http://mid.gmane.org/16960.15685.26911.644835@parhasard.net ChangeLog addition: 2011-08-27 Aidan Kehoe <kehoea@parhasard.net> * configure.ac: Check whether X11/XF86keysym.h is available, to allow us to avoid a bug in the interaction of XKB and XLookupKeysym. * configure: Regenerate.

--- a/configure	Wed Aug 24 23:41:29 2011 +0100
+++ b/configure	Sat Aug 27 20:35:23 2011 +0100
@@ -13351,7 +13351,7 @@
 done
 
 
-  for ac_header in X11/Xlocale.h X11/Xfuncproto.h
+  for ac_header in X11/Xlocale.h X11/Xfuncproto.h X11/XF86keysym.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"