diff --git a/config.h.in b/config.h.in
index f15909fdf..586753a8c 100644
--- a/config.h.in
+++ b/config.h.in
@@ -456,6 +456,12 @@
 /* Define to 1 if you have the `strchr' function. */
 #undef HAVE_STRCHR
 
+/* Define to 1 if you have the `strdup' function. */
+#undef HAVE_STRDUP
+
+/* Define to 1 if you have the `strndup' function. */
+#undef HAVE_STRNDUP
+
 /* Define to 1 if you have the `strerror' function. */
 #undef HAVE_STRERROR