$NetBSD: patch-ad,v 1.3 2006/04/11 15:08:38 joerg Exp $

--- sbr/discard.c.orig	2006-04-11 13:20:41.000000000 +0000
+++ sbr/discard.c
@@ -61,7 +61,7 @@ FILE   *io;
 #endif	/* SYS5 */
 #endif	/* POSIX */
 
-#ifdef _FSTDIO
+#if defined(_FSTDIO) || defined(__DragonFly__)
     fpurge (io);
 #else
 #ifdef _STDIO_USES_IOSTREAM