diff -r 0ddcc9f9a203 -r 45f4b49fd1ea core/HalfLife2.cpp
--- a/core/HalfLife2.cpp	Fri Oct 26 16:27:00 2012 -0400
+++ b/core/HalfLife2.cpp	Fri Oct 26 16:28:05 2012 -0400
@@ -40,6 +40,7 @@
 #include <Logger.h>
 #include "LibrarySys.h"
 #include "logic_bridge.h"
+#include <tier0/mem.h>
 
 
 typedef ICommandLine *(*FakeGetCommandLine)();
@@ -51,7 +52,10 @@
 #define TIER0_NAME			"libtier0.dylib"
 #define VSTDLIB_NAME		"libvstdlib.dylib"
 #elif defined __linux__
-#if SOURCE_ENGINE >= SE_CSS
+#if SOURCE_ENGINE == SE_ORANGEBOXVALVE
+#define TIER0_NAME			"libtier0_srv.so"
+#define VSTDLIB_NAME		"libvstdlib_srv.so"
+#elif SOURCE_ENGINE >= SE_CSS
 #define TIER0_NAME			"libtier0.so"
 #define VSTDLIB_NAME		"libvstdlib.so"
 #else