Index: library/xml/TclExpat-1.1/configure
===================================================================
diff -u -r6c86fa6bef2f9e07b87cc7913398e86dd9af8316 -r5f986f77097e53f96b60f28a7ccabeb2411f67a0
--- library/xml/TclExpat-1.1/configure	(.../configure)	(revision 6c86fa6bef2f9e07b87cc7913398e86dd9af8316)
+++ library/xml/TclExpat-1.1/configure	(.../configure)	(revision 5f986f77097e53f96b60f28a7ccabeb2411f67a0)
@@ -733,6 +733,7 @@
 enable_option_checking
 with_xotcl
 with_expat
+enable_forward_compat86
 with_tcl
 with_tclinclude
 enable_threads
@@ -1362,6 +1363,8 @@
   --disable-option-checking  ignore unrecognized --enable/--with options
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
+  --forward-compat86      build XOTcl und Tcl 8.5 with forward compatibilit
+                          for Tcl 8.6 (default: disabled)
   --enable-threads        build with threads
   --enable-shared         build and link with shared libraries (default: on)
   --enable-64bit          enable 64bit support (default: off)
@@ -2354,6 +2357,14 @@
 fi
 
 
+# Check whether --enable-forward-compat86 was given.
+if test "${enable_forward_compat86+set}" = set; then :
+  enableval=$enable_forward_compat86; enable_forwardcompat=$enableval
+else
+  enable_forwardcompat=no
+fi
+
+
 case $with_expat in
     bundle) ;;
     sys)
@@ -8565,7 +8576,7 @@
 
 $as_echo "#define USE_TCL_STUBS 1" >>confdefs.h
 
-#AC_DEFINE(USE_TK_STUBS)
+#AC_DEFINE([USE_TK_STUBS])
 
 #--------------------------------------------------------------------
 # This macro generates a line to use when building a library.  It