diff --git a/config.h.in b/config.h.in
index c9d4ed9..4235374 100644
--- a/config.h.in
+++ b/config.h.in
@@ -36,6 +36,9 @@
 /* Define to 1 if you have the <sys/queue.h> header file. */
 #undef HAVE_SYS_QUEUE_H
 
+/* Define to 1 if you have the <sys/select.h> header file. */
+#undef HAVE_SYS_SELECT_H
+
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #undef HAVE_SYS_STAT_H