$OpenBSD$
http://trac.wildfiregames.com/browser/ps/trunk/libraries/nvtt/issue176.patch
--- src/nvcore/poshlib/posh.h.orig	Wed Jun 20 23:14:49 2012
+++ src/nvcore/poshlib/posh.h	Wed Jun 20 23:15:20 2012
@@ -293,6 +293,11 @@ Metrowerks:
 #  define POSH_OS_STRING "Linux"
 #endif
 
+#if defined __OpenBSD__
+#  define POSH_OS_OPENBSD 1
+#  define POSH_OS_STRING "OpenBSD"
+#endif
+
 #if defined __CYGWIN32__
 #  define POSH_OS_CYGWIN32 1
 #  define POSH_OS_STRING "Cygwin"