$OpenBSD$
http://trac.wildfiregames.com/browser/ps/trunk/libraries/nvtt/issue176.patch
--- src/nvcore/Debug.cpp.orig	Wed Jun 20 23:11:45 2012
+++ src/nvcore/Debug.cpp	Wed Jun 20 23:14:33 2012
@@ -34,11 +34,14 @@
 #	endif
 #endif
 
-#if NV_OS_DARWIN
+#if NV_OS_DARWIN || NV_OS_OPENBSD
 #	include <unistd.h>	// getpid
 #	include <sys/types.h>
+#	include <sys/param.h>
 #	include <sys/sysctl.h>	// sysctl
-#	include <sys/ucontext.h>
+#	if !NV_OS_OPENBSD
+#		include <sys/ucontext.h>
+#	endif
 #	undef HAVE_EXECINFO_H
 #	if defined(HAVE_EXECINFO_H) // only after OSX 10.5
 #		include <execinfo.h> // backtrace
@@ -198,6 +201,14 @@ namespace 
 				ucontext_t * ucp = (ucontext_t *)secret;
 				return (void *) ucp->uc_mcontext->ss.eip;
 #			endif
+#		endif
+#	elif NV_OS_OPENBSD
+#		if NV_CPU_X86_64
+			ucontext_t * ucp = (ucontext_t *)secret;
+			return (void *)ucp->sc_rip;
+#		elif NV_CPU_X86
+			ucontext_t * ucp = (ucontext_t *)secret;
+			return (void *)ucp->sc_eip;
 #		endif
 #	else
 #		if NV_CPU_X86_64