1 files changed, 3 insertions, 0 deletions
diff --git a/mx.h b/mx.h
index 57c23cdc..0a28f2b0 100644
--- a/mx.h
+++ b/mx.h
@@ -8,4 +8,7 @@ struct mxentry
 
 extern struct mxentry * getmxrecords(const char *);
 
+/* some versions of FreeBSD should declare this but don't */
+extern int h_errno;
+
 /* mx.h ends here */