Index: src/core/openjph/ojph_arch.h
--- src/core/openjph/ojph_arch.h.orig
+++ src/core/openjph/ojph_arch.h
@@ -108,6 +108,8 @@ namespace ojph {
 #define OJPH_OS_ANDROID
 #elif (defined __linux)
 #define OJPH_OS_LINUX
+#elif (defined __OpenBSD__)
+#define OJPH_OS_OPENBSD
 #endif
 
   /////////////////////////////////////////////////////////////////////////////
