Index: libX11-1.3.4/configure.ac
===================================================================
--- libX11-1.3.4.orig/configure.ac
+++ libX11-1.3.4/configure.ac
@@ -355,8 +355,14 @@ AC_CHECK_FUNC(poll, [AC_DEFINE(USE_POLL,
 # Find keysymdef.h
 #
 AC_MSG_CHECKING([keysymdef.h])
-dir=`$PKG_CONFIG --variable=includedir xproto`
-KEYSYMDEF="$dir/X11/keysymdef.h"
+AC_ARG_WITH(keysymdef,
+        AC_HELP_STRING([--with-keysymdef=DIR/keysymdef.h], [The location of keysymdef.h]),
+        KEYSYMDEF=$withval, KEYSYMDEF="")
+
+if test x$KEYSYMDEF = x; then
+        dir=`${PKG_CONFIG} --variable=includedir xproto`
+        KEYSYMDEF="$dir/X11/keysymdef.h"
+fi
 if test -f "$KEYSYMDEF"; then
         AC_MSG_RESULT([$KEYSYMDEF])
 else