$OpenBSD$
--- src/tools/radiant/radiant/mainframe.cpp.orig	Mon Apr 25 19:52:27 2011
+++ src/tools/radiant/radiant/mainframe.cpp	Mon Apr 25 19:53:20 2011
@@ -426,7 +426,7 @@ class ModuleLoader
 					_ext("dll")
 #elif defined (__APPLE__)
 					_ext("dylib")
-#elif defined(__linux__) || defined (__FreeBSD__)
+#elif defined(__linux__) || defined (__FreeBSD__) || defined (__OpenBSD__)
 					_ext("so")
 #endif