$OpenBSD: patch-runtime_in,v 1.1 2013/12/19 18:13:48 shadchin Exp $
--- runtime.in.orig	Thu Nov 17 03:35:43 2011
+++ runtime.in	Sat Nov 19 16:49:41 2011
@@ -85,7 +85,7 @@ stringarray2* => stringArray2()
 #include "process.h"
 #include "arrayop.h"
    
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(__OpenBSD__)
 extern "C" int isnan(double);  
 #endif
 
