--- acl.old/builddefs.in	2007-05-06 21:07:16.000000000 +0100
+++ acl-2.2.42/include/builddefs.in	2007-05-06 21:08:04.000000000 +0100
@@ -4,6 +4,8 @@
 # @configure_input@
 #
 
+top_builddir = @top_builddir@
+
 ifndef _BUILDDEFS_INCLUDED_
 _BUILDDEFS_INCLUDED_ = 1