--- configure.orig	2017-05-09 05:22:02.000000000 +0200
+++ configure	2018-04-10 21:57:26.402409000 +0200
@@ -18751,6 +18751,15 @@
 rm -f conftest*
 
 
+	ac_fn_c_check_member "$LINENO" "icaltimetype" "is_utc" "ac_cv_member_icaltimetype_is_utc" "#include <libical/ical.h>
+"
+if test "x$ac_cv_member_icaltimetype_is_utc" = xyes; then :
+
+$as_echo "#define ICALTIME_HAS_IS_UTC /**/" >>confdefs.h
+
+fi
+
+
 	ENABLE_RSCALE=yes
 
 pkg_failed=no