Added mktime to checked functions
diff --git a/config.h.in b/config.h.in
index 7c7d13c..01f6c97 100644
--- a/config.h.in
+++ b/config.h.in
@@ -223,6 +223,9 @@
 /* Define if you have the mkfifo function.  */
 #undef HAVE_MKFIFO
 
+/* Define if you have the mktime function.  */
+#undef HAVE_MKTIME
+
 /* Define if you have the nice function.  */
 #undef HAVE_NICE