--- ./omni/usd/UsdManager.h
+++ ./omni/usd/UsdManager.h
@@ -47,9 +47,9 @@

 namespace hydra
 {
-class IHydraEngineFactory;
+// class IHydraEngineFactory;
 enum class EngineCreationFlags : uint32_t;
-using IHydraEngineFactoryPtr = carb::ObjectPtr<IHydraEngineFactory>;
+// using IHydraEngineFactoryPtr = carb::ObjectPtr<IHydraEngineFactory>;
 struct OpaqueSharedHydraEngineContext;
 typedef struct OpaqueSharedHydraEngineContext* OpaqueSharedHydraEngineContextPtr;

@@ -105,8 +105,8 @@
      * Use by IHydraEngines at load/unload to register their factory class
      *
      */
-    OMNI_USD_API static void registerHydraEngineFactory(const char* name,
-                                                        omni::usd::hydra::IHydraEngineFactoryPtr factory);
+    // OMNI_USD_API static void registerHydraEngineFactory(const char* name,
+    //                                                     omni::usd::hydra::IHydraEngineFactoryPtr factory);

     OMNI_USD_API static void unregisterHydraEngineFactory(const char* name);