diff -Nurb libical-0.44.orig/configure libical-0.44/configure
--- libical-0.44.orig/configure	2009-09-27 04:40:12.000000000 +0200
+++ libical-0.44/configure	2009-10-28 11:17:33.000000000 +0100
@@ -19537,7 +19537,7 @@
 if test "x$ac_cv_ical_errors_are_fatal" != "xyes"; then
 
 cat >>confdefs.h <<\_ACEOF
-#define ICAL_ERRORS_ARE_FATAL 0
+#undef ICAL_ERRORS_ARE_FATAL
 _ACEOF
 
 else