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diff --git a/mx.h b/mx.h
index b32a7ef4..3bb1e34a 100644
--- a/mx.h
+++ b/mx.h
@@ -1,14 +1,23 @@
-/* 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
 {
-    unsigned char	*name;
-    int			pref;
+    char	*name;
+    int		pref;
 };
 
-extern struct mxentry * getmxrecords(const unsigned char *);
+extern struct mxentry * getmxrecords(const char *);
 
-/* some versions of FreeBSD should declare this but don't */
+#if !HAVE_DECL_H_ERRNO
 extern int h_errno;
+#endif
 
 /* mx.h ends here */