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diff --git a/mx.h b/mx.h
index 30da95b5..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
 {
@@ -6,8 +14,10 @@ struct mxentry
     int		pref;
 };
 
-#ifdef HAVE_PROTOTYPES
 extern struct mxentry * getmxrecords(const char *);
-#endif /* HAVE_PROTOTYPES */
+
+#if !HAVE_DECL_H_ERRNO
+extern int h_errno;
+#endif
 
 /* mx.h ends here */