--- src/osgPlugins/osc/osc/OscHostEndianness.h.orig	Thu Jul 23 13:14:00 2015
+++ src/osgPlugins/osc/osc/OscHostEndianness.h	Thu Sep 10 20:45:13 2015
@@ -77,6 +77,14 @@
         #else
             #error Unknown machine endianness detected.
         #endif
+    #elif defined(__OpenBSD__)
+        #if (_BYTE_ORDER == _LITTLE_ENDIAN)
+            #define __LITTLE_ENDIAN__
+        #elif (_BYTE_ORDER == _BIG_ENDIAN)
+            #define __BIG_ENDIAN__
+        #else
+            #error Unknown machine endianness detected.
+        #endif
     #endif
 
     #if   defined(__LITTLE_ENDIAN__)
