$NetBSD: patch-ah,v 1.1 2005/12/31 00:39:01 joerg Exp $

--- chicken.h.orig	2005-12-30 23:53:55.000000000 +0000
+++ chicken.h
@@ -210,7 +210,7 @@ int strncasecmp(const char *one, const c
 # define isatty            _isatty
 #endif
 
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__)
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
 # define C_GNU_ENV
 #endif