diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 3665e799e7b..6d572c38204 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -196,6 +196,12 @@
 /* Define to 1 if you have the `getpeerucred' function. */
 #undef HAVE_GETPEERUCRED
 
+/* Define to 1 if you have the <gssapi_ext.h> header file. */
+#undef HAVE_GSSAPI_EXT_H
+
+/* Define to 1 if you have the <gssapi/gssapi_ext.h> header file. */
+#undef HAVE_GSSAPI_GSSAPI_EXT_H
+
 /* Define to 1 if you have the <gssapi/gssapi.h> header file. */
 #undef HAVE_GSSAPI_GSSAPI_H