--- a/configure.in	Thu Dec 11 23:28:50 2008 +0000
+++ b/configure.in	Mon Jan 05 04:13:42 2009 +0000
@@ -83,6 +83,9 @@
 AC_CHECK_FASTCALL([
    AC_DEFINE(HAVE_FASTCALL, [1], [Use fast register-passing calling conventions])
 ])
+AC_CHECK_FRAME_ADDRESS( [
+   AC_DEFINE(HAVE_FRAME_ADDRESS, [1], [Define if we have a working builtin frame_address])
+], [ AC_MSG_WARN([Memory exceptions will be slow]) ])
 
 
 dnl ------------ Check if we're building on Darwin --------------