--- config.h.in.orig	2017-05-09 05:22:02.000000000 +0200
+++ config.h.in	2018-04-08 23:58:00.107115000 +0200
@@ -397,6 +397,9 @@
 /* Do we have zlib? */
 #undef HAVE_ZLIB
 
+/* Does icaltimetype have is_utc field? */
+#undef ICALTIME_HAS_IS_UTC
+
 /* Define to the sub-directory where libtool stores uninstalled libraries. */
 #undef LT_OBJDIR