--- configure.ac~	2005-05-08 17:54:59.000000000 +0200
+++ configure.ac	2009-01-31 14:50:16.000000000 +0100
@@ -51,6 +51,7 @@
 # libtool option to control which symbols are exported
 # right now, symbols starting with _ are not exported
 LIBTOOL_EXPORT_OPTIONS='-export-symbols-regex "^[[^_]].*"'
+AC_SUBST(LIBTOOL_EXPORT_OPTIONS)
 
 # Extra args.
 AC_ARG_ENABLE(debug,