diff --git a/src/config.h.in b/src/config.h.in
index b306a123e3..b9111250d4 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -38,3 +38,11 @@
 /* Define if you can write to argc[] strings */
 #undef HAVE_WRITABLE_ARGV
 
+/* Define to 1 if you have the <sys/time.h> header file. */
+#undef HAVE_SYS_TIME_H
+
+/* Define to 1 if you have the <time.h> header file. */
+#undef HAVE_TIME_H
+
+/* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
+#undef TIME_WITH_SYS_TIME