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diff --git a/mx.h b/mx.h
index 57c23cdc..3bb1e34a 100644
--- a/mx.h
+++ b/mx.h
@@ -1,4 +1,12 @@
-/* mx.h -- name-to-preference association for MX records */
+/* mx.h -- name-to-preference association for MX records.
+ * For license terms, see the file COPYING in this directory.
+ */
+
+#include "config.h"
+
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
 
 struct mxentry
 {
@@ -8,4 +16,8 @@ struct mxentry
 
 extern struct mxentry * getmxrecords(const char *);
 
+#if !HAVE_DECL_H_ERRNO
+extern int h_errno;
+#endif
+
 /* mx.h ends here */