$NetBSD: patch-ae,v 1.3 2014/02/13 10:10:06 mrg Exp $

--- Engine/linevent.c.orig	2013-01-07 04:49:34.000000000 -0800
+++ Engine/linevent.c	2014-02-12 20:37:17.000000000 -0800
@@ -31,7 +31,7 @@
 #include "linevent.h"
 
 #ifdef PIPES
-# if defined(SGI) || defined(LINUX) || defined(NeXT) || defined(__MACH__)
+# if defined(SGI) || defined(LINUX) || defined(NeXT) || defined(__MACH__) || defined(__NetBSD__) || defined(__DragonFly__)
 #  define _popen popen
 #  define _pclose pclose
 # elif defined(__BEOS__) || defined(__HAIKU__) || defined(__MACH__)