$OpenBSD: patch-simgear_compiler_h,v 1.3 2021/07/12 20:52:43 pascal Exp $
--- simgear/compiler.h.orig	Tue Nov 22 10:06:52 2016
+++ simgear/compiler.h	Fri Dec  2 12:07:44 2016
@@ -105,7 +105,8 @@
 #  define SG_WINDOWS
 #endif
 
-#if defined(__linux__) || defined(_AIX) || defined ( sgi )
+#if defined(__linux__) || defined(_AIX) || defined ( sgi ) || \
+	defined(__OpenBSD__)
 #  define SG_UNIX
 #endif
 
