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/src/config.h.in	Wed Aug 24 23:41:29 2011 +0100
+++ b/src/config.h.in	Sat Aug 27 20:35:23 2011 +0100
@@ -284,6 +284,7 @@
 #undef HAVE_SYS_WAIT_H
 #undef HAVE_LIBINTL_H
 #undef HAVE_X11_XLOCALE_H
+#undef HAVE_X11_XF86KEYSYM_H
 
 /* About __STDC__: Different compilers differ wrt __STDC__.  Sunpro C
     defines it, but its value is 0 unless we disable non-ANSI extensions.