diff --git a/astlpc.c b/astlpc.c
index e701a6d..bf35046 100644
--- a/astlpc.c
+++ b/astlpc.c
@@ -2,12 +2,17 @@
 
 #include <assert.h>
 #include <endian.h>
+#include <err.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 
 #define pr_fmt(x) "astlpc: " x
 
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include "libmctp.h"
 #include "libmctp-alloc.h"
 #include "libmctp-log.h"
@@ -498,12 +503,14 @@
 struct mctp_binding_astlpc * __attribute__((const))
 	mctp_astlpc_init_fileio(void)
 {
+	warnx("Missing support for file IO");
 	return NULL;
 }
 
 int __attribute__((const)) mctp_astlpc_get_fd(
 		struct mctp_binding_astlpc *astlpc __attribute__((unused)))
 {
+	warnx("Missing support for file IO");
 	return -1;
 }
 #endif