$NetBSD: patch-ah,v 1.3 2007/02/15 18:26:15 joerg Exp $

--- src/include/ivstd/nan.h.orig	2007-02-15 15:31:06.000000000 +0000
+++ src/include/ivstd/nan.h
@@ -3,7 +3,7 @@
 
 #if defined(__GLIBC__) && (__GLIBC__==2 && __GLIBC_MINOR__>0 || __GLIBC__>2)
 #include <bits/nan.h>
-#elif !defined(__CYGWIN__) && !defined(__NetBSD__) && !defined(__FreeBSD__) && !defined(__APPLE__)
+#elif !defined(__CYGWIN__) && !defined(__NetBSD__) && !defined(__FreeBSD__) && !defined(__APPLE__) && !defined(__DragonFly__)
 #include_next <nan.h>
 #else
 #include <math.h>
@@ -12,7 +12,7 @@
 #include <ieeefp.h>
 #endif
 
-#if defined(__sun__) && defined(__svr4__) || defined(__CYGWIN__) || defined(__linux__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__APPLE__)
+#if defined(__sun__) && defined(__svr4__) || defined(__CYGWIN__) || defined(__linux__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__APPLE__) || defined(__DragonFly__)
 #define isnanorinf(dval) (!finite(dval))
 #elif defined(__alpha)
 #define isnanorinf(dval) (IsNANorINF(dval))