1 files changed, 3 insertions, 0 deletions
diff --git a/mx.h b/mx.h
index 0a28f2b0..cc0e28d5 100644
--- a/mx.h
+++ b/mx.h
@@ -9,6 +9,9 @@ struct mxentry
 extern struct mxentry * getmxrecords(const char *);
 
 /* some versions of FreeBSD should declare this but don't */
+/* But only declare it if it isn't already */
+#ifndef h_errno
 extern int h_errno;
+#endif /* ndef h_errno */
 
 /* mx.h ends here */