$NetBSD: patch-src_dbmail.h.in,v 1.2 2016/02/02 14:31:59 fhajny Exp $

Define _NETBSD_SOURCE so that _NI_* are defined.
Do not included features.h because it doesn't exist.

--- src/dbmail.h.in.orig	2015-01-25 10:20:50.000000000 +0000
+++ src/dbmail.h.in
@@ -39,7 +39,11 @@
 #else
 
 #define _XOPEN_SOURCE	500
+#ifdef __NetBSD__
+#define _NETBSD_SOURCE
+#elif !defined(__sun)
 #include <features.h>
+#endif
 
 #endif